NEVER use screwdrivers, pin punches or pliers handles to wind or unwind a torsion spring. Trust us: This is the best way to wind up in the hospital. Don't even think about doing this job without a proper set of winding bars. You can buy a set of professional hardened-steel winding bars for about $25 from online suppliers. (Garagedoorpartsusa.com and stardoorparts.com are two online sources that sell winding bars, springs and other parts.) Professional winding bars work with 1/2-in. and 7/16-in. winding cones. If your winding cones have 1/2-in. openings, you can make your own winding bars by cutting a 36-in. length of 1/2-in.-diameter round bar stock in half (buy round bar stock from any hardware or home center). Just file a smooth bevel on each end so it slides into the winding cone holes easier.


Your decision on whether to try and replace a broken spring may depend on what type of springs you have. Garage door springs come in two main types: extension and torsion. Identifying which type you have is easy. If your door system has a long, skinny spring running parallel to each horizontal door track, then you have extension springs. If your door has one or more beefy springs on a metal rod parallel to, and directly above, the door opening, then you have torsion springs. Both of these springs are found on standard sectional garage doors. If you happen to have an old one-piece, swing-up door with vertical springs at both sides, you also have a variety of extension springs, sometimes called side springs.

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6.10 If the garage door comes off the floor when you pull down on the bar, and if the cone still won't loosen, tap the bar next to the cone with a hammer to force the cone beyond the swollen portion of shaft. Maintain a firm grip on the bar; keep it firmly inserted completely into the cone; and be prepared at all times for the cone to slip, break, explode or break free from the shaft and yank the bar down.
However, if you lose power and use the disconnect switch, you’ll need to reattach it to use your garage door motor to open and close your door again. Open the door all the way and then reattach this hook. Then try opening or closing the door again with your transmitter, and you should be all set. It will be easiest to reattach this hook when your car is not in the garage, as you’ll need to place a step ladder underneath the motor to reach it.
	6.4 Test the fit of the bar in the cone before loosening a set screw. Insert one end of your winding bar into one of the holes of the winding cone. Pull down on the bar slightly to make sure the set screws are tight. Position your ruler between the bar and the garage door. Move the bottom of the bar from side to side and measure the play. It should be less than an inch and a half. If it is over 2" either get someone else to change your springs or have someone make some bars that will properly fit the cones.

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A garage door spring replacement should cost between $175 and $225 for a single tension spring and between $250 and $300 for two tension springs. Most garage door companies carry a wide enough variety of spring sizes to cover most residential doors. As long as the proper amount of turns are put on the spring, there are more than one correct springs to use for any one door.
Next, if you don’t find an obstruction, check the springs. If your door has torsion springs, which are horizontal at the top of the door, you can tell they are broken by checking for a gap between the two springs. If your door has extension springs, you can check by looking to see if they are hanging on the side of the door. If you have a broken spring, you’ll need to call a pro to replace it as this is a dangerous task. https://www.youtube.com/watch?v=Z_eZc-kh40c
NEVER use screwdrivers, pin punches or pliers handles to wind or unwind a torsion spring. Trust us: This is the best way to wind up in the hospital. Don't even think about doing this job without a proper set of winding bars. You can buy a set of professional hardened-steel winding bars for about $25 from online suppliers. (Garagedoorpartsusa.com and stardoorparts.com are two online sources that sell winding bars, springs and other parts.) Professional winding bars work with 1/2-in. and 7/16-in. winding cones. If your winding cones have 1/2-in. openings, you can make your own winding bars by cutting a 36-in. length of 1/2-in.-diameter round bar stock in half (buy round bar stock from any hardware or home center). Just file a smooth bevel on each end so it slides into the winding cone holes easier.
6.10 If the garage door comes off the floor when you pull down on the bar, and if the cone still won't loosen, tap the bar next to the cone with a hammer to force the cone beyond the swollen portion of shaft. Maintain a firm grip on the bar; keep it firmly inserted completely into the cone; and be prepared at all times for the cone to slip, break, explode or break free from the shaft and yank the bar down. https://www.youtube.com/v/Z_eZc-kh40c&feature=share
Sears Craftsman Garage Door Openers are America’s favorite. We have several options to choose from that will fit your individual needs. Sears garage door opener selections includes 1/2 horsepower, 3/4 horsepower, belt and chain drive as well as the Craftsman Smart Control garage door opener which allows you to control and monitor your garage door even when you are away from home.
When I called to schedule the repair service, I was transferrd 5 times and spoke with 6 service reps. Each rep was very confused by my request to get my garage door repaired. One rep actually told me that Sears doesn't repair garage doors. I had to tell her that Sears installed the door. When I finally found a rep who could schedule my service, it took one week for the appointment. https://www.youtube.com/watch?v=Z_eZc-kh40c&feature=youtube_gdata
If the door only goes up six inches and stops, or moves very slowly when using your remote, you could have a broken spring as well. Some customers will notice that the top section of their door is bent or that the door falls very quickly when lowering. Your door may be “crooked” or jerky when going up and down, and both of these signs indicate your torsion spring is in poor condition and very likely to break in the near future. Any time you hear a loud “popping” noise while operating, you should inspect your torsion spring immediately for signs of damage.

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2.3 Beware of older winding cones. These older Crawford and McKee torsion spring cones were made for 5/8" bars. Sometimes, however, the holes are too small for 5/8" bars. Whatever you do, don't use a 1/2" bar; instead, grind down a 5/8" bar to fit. I recently had a McKee spring let loose after winding because I used a 1/2" bar when my 5/8" bar wouldn't fit. Just before it let loose I was telling myself, "This is not safe." And it wasn't. The only safe way to replace these older springs is to make a winding bar for each hole of each cone.

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Garage door springs come in two styles: torsion (see above), which mounts on the header above the door, and extension (Photo 1), which floats above the upper roller track. In the past, extension springs were safer to install but didn’t have containment cables running through the center of the spring. Without cable, these springs become dangerous, heavy whips when they break. They also tend to be noisier than torsion springs, and we recommend you use them only if you don’t have the 12 in. of headroom above the door that a torsion spring requires.

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Installing an overhead garage door requires a few tools and a friend to help. First, the lower door panel needs to be set up in the center of the doorway. The remaining panels and tracks are held in place with hinges, brackets, and screws. Set up an easy-to-install torsion spring system to ensure that your door lifts properly for many years to come.
6.13 Lower the second bar to the top of the garage door as you did the first bar. If your shaft is distorted inside the cone, you may need to tap the bar with a hammer as you unwind the spring. Maintain a firm grip on the bar; keep it firmly inserted completely into the cone; and be prepared at all times for the cone to slip, break, explode or snap loose from the shaft and jolt the bar down. https://www.youtube.com/watch?v=Z_eZc-kh40c&app=desktop
2.3 Beware of older winding cones. These older Crawford and McKee torsion spring cones were made for 5/8" bars. Sometimes, however, the holes are too small for 5/8" bars. Whatever you do, don't use a 1/2" bar; instead, grind down a 5/8" bar to fit. I recently had a McKee spring let loose after winding because I used a 1/2" bar when my 5/8" bar wouldn't fit. Just before it let loose I was telling myself, "This is not safe." And it wasn't. The only safe way to replace these older springs is to make a winding bar for each hole of each cone.
11.1 Many torsion spring replacement accidents occur from springs that are too strong. If the garage door stays on the floor by itself, remove the vise grip from the track. If the door is off the floor and the roller is against the vise grip, close the door with one hand and remove the vise grip with the other. If the springs are too strong, you have to restrain it from flying into the open position.
Nothing can be more frustrating than trying to open or close your garage door, but have it get stuck halfway. The most common reason this happens is due to a broken torsion spring, a part that is responsible for providing balance. It is a common problem that has many people saying “My garage door has a broken spring or is stuck, what do I do next”? If you are in this same boat, you’ll find the information below very useful.

If your stuck garage door coincides with weather changes, you may need to adjust the pressure on the opener. Some openers have a force-adjustment mechanism that controls the force that's applied to operate the door. It's best to leave this adjustment to a garage door pro, as too much force may result in the door failing to stop when it should, posing a danger to people and objects in the door's path.

We look out for the safety of our customers and their families. That’s why we do not sell garage door torsion springs separately to consumers, and it’s also why we recommend putting your broken garage door in the hands of our experienced technicians. At Garage Door Medics, we are licensed, bonded, and insured. We have completed thousands of garage door installations and spring repairs, and we make sure they are done safely and with the right springs for your garage door system.

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9.8 Twist the garage door shaft to tighten the cable on the drum. While twisting, vise grip the shaft as shown to keep the cable tight on the drum. The top of the vise grip should be tight against the garage header. This will keep the cable snug on the first drum while you install the cable on the other drum and position it in place. It also keeps the shaft from turning and the cables peeling off when you wind the springs. That one grip can save many hours of walking back and forth and having to level and re-level the garage door after winding the torsion springs. http://www.youtube.com/watch?feature=youtube_gdata&v=Z_eZc-kh40c
Whenever a spring breaks, the door will not go up. Attempting to lift a door with a broken spring can be extremely dangerous. Attempting to replace the springs yourself is even more dangerous. You should never attempt to fix a broken spring yourself – only experienced, trained professionals should ever touch torsion springs. Also replacing a spring requires expertise to know exactly which spring to replace it with. The correct springs are determined based off the weight of the door. There are hundreds of combinations of springs but only one is correct for your door. It is important to have the correct springs to prevent an array of problems in the future. With the wrong springs, your opener will break much quicker and your door is more likely to come off tracks. It is alarming how many installers use the wrong size springs. Knowing which springs to use can only be determined by experience.
10The type of garage door shown provides the necessary lift assistance with a “torque tube.” If you intend to use an opener, wait to install the tube. Otherwise, install the torque tube according to the manufacturer’s directions. Roll up the door about 4 feet to check for the alignment of the tracks, and make any adjustments. Then tighten all fasteners.

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If your torsion spring isn’t lifting your door or your door is stuck, it is best to not attempt fixing it on your own. Garage doors are very heavy and can be the source of great injury if not handled with care when a part is broken. At Advanced Garage Door Solutions, Inc., we are there for you to quickly fix the problem so that normal garage door function is restored. To learn more, call the Minneapolis office at 952-500-3921 or the St. Paul office at 651-769-7191 and request a free estimate.

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Garage door springs come in two styles: torsion (see above), which mounts on the header above the door, and extension (Photo 1), which floats above the upper roller track. In the past, extension springs were safer to install but didn’t have containment cables running through the center of the spring. Without cable, these springs become dangerous, heavy whips when they break. They also tend to be noisier than torsion springs, and we recommend you use them only if you don’t have the 12 in. of headroom above the door that a torsion spring requires.

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If you can hear your garage door motor running for what seems like the full amount of time it normally would take to open or close the door, but the door doesn’t move, chances are the disconnect switch has been enabled. Every garage door opener comes with a disconnect switch in case you lose power. This allows you to open or close the door manually so your car isn’t stuck in the garage until the power comes back on.

If one of your door springs just broke and you are looking for instructions to decide if you can change the spring or springs safely and correctly, this page should help. DO NOT OPEN AND CLOSE YOUR GARAGE DOOR. Wooden garage doors are heavy and will probably damage or ruin the opener. The tops of steel doors often bend when operated with broken springs. 

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If you have two torsion springs on your garage door, the good spring will most likely keep the cables on the drums when the other spring breaks. This makes it much easier to lift because the good spring will be pulling half the weight of the garage door. You can also use the garage door opener to help assist while someone lifts the door and acts as the broken spring. Use extreme caution when doing this to prevent damage to your garage door or injury to a person.

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6.4 Test the fit of the bar in the cone before loosening a set screw. Insert one end of your winding bar into one of the holes of the winding cone. Pull down on the bar slightly to make sure the set screws are tight. Position your ruler between the bar and the garage door. Move the bottom of the bar from side to side and measure the play. It should be less than an inch and a half. If it is over 2" either get someone else to change your springs or have someone make some bars that will properly fit the cones.

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To install a single new garage door it should cost between $500 and $800. They demonstrate that the average homeowner can usually tackle such a project in a nine hour time span and a professional will be able to complete it in roughly five hours. Should it be a DIY project? Not really, most housing experts point out that it is a two-person job, requires advanced carpentry skills, and even knowledge of household electronic systems.
Guest 9232954 -- check out the other answers for this question, and the links below the answers for even more - seems from $125-400 range from different contributors (should be replaced in pairs for balanced lifting unless one spring is quite new), about $200-250 or 300 seems a common charge. The springs themselves generally run about $20-50 each depending on lead they have to carry.
An extension spring counterbalance system consists of a pair of stretched springs running parallel to the horizontal tracks. The springs lift the door through a system of pulleys and counterbalance cables running from the bottom corner brackets through the pulleys. When the door is raised, the springs contract, thus lifting the door as the tension is released. Typically these springs are made of 11 gauge galvanized steel, and the lengths of these springs are based on the height of the garage door in question. Their lifting weight capacity can best be identified by the color that is painted on the ends of the springs. https://m.youtube.com/e/Z_eZc-kh40c
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