Torsion-spring doors have a drum-like pulley at each end of the metal rod that runs through the springs. Each pulley has a cable attached to the bottom of the door. The springs and pulleys are fixed to the rod so they all rotate together. When the door closes, the rod turns and winds up the springs, creating tension. When the door opens, the springs release the tension and turn the rod in the opposite direction.

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All measurements should be in feet and inches. Step 1, measure across the existing door or desired space for the width, then up and down for the height. The rough opening of your space should be the same size as the door. Step 2, measure the sideroom, which is the space beside your door. Measure the width of the left side, and then the width of the right side. Step 3, measure the space above the door, which is called the headroom. Measure the height of the distance between the top of the door opening and the ceiling. Step 4, measure the ceiling, which is called the backroom. You’ll need to measure the distance of the garage door opening toward the back wall of your garage. You should have 6 total measurements in all once you’ve finished measuring the space. Keep in mind that having an automatic garage door opener installed might call for additional backroom or ceiling space.

9.16 If you cannot get the stationary cones to finger-tighten against the center bracket, we recommend installing washers between the winding cone that houses the bearing and the spring bracket. This is a common problem with torsion springs on older Windsor garage doors because their steel bearings are often wider and they extend beyond the stationary cone. Raynor garage doors also have wider bearings that fit properly in their 2 1/4" stationary cones, but washers may need to be installed if their bearings are installed in 1 3/4" or 2" stationary cones, or if some of their older bearings are installed in their newer cones that are installed on older brackets.
From a big-box store, basic garage door cables can run between $8 and $20, depending on the product. Your pro may charge you a different cost if they provide the cables. Your cables may not need to be replaced if they have simply come off the track, but broken cables will need to be completely removed and replaced. In either instance, the pros will need to secure or take down the door; unwind the springs; reset or replace the rollers, cables, and drums; and then wind the springs once more. For example, a pro could reset cables that have come off the track for $129.99. The average national cost for a garage door repair specialist is $80 - $110 per hour and the typical cost to replace a broken garage door cable is anywhere from $130 to $200.
Gather the supplies and tools needed for changing the springs safely. In addition to the torsion springs you'll need a minimum of one or two 10" vise grips, an adjustable wrench, and two 1/2" X 18" winding bars. Most hardware stores sell 1/2" X 36" steel rods that can be cut in half. You'll also need a firm ladder and a rag for cleaning your hands. A ruler and a file may also be necessary; a socket wrench and sockets would shorten the time required. Finally, make sure your garage is lighted well.
The low rating on the CS is due to the fact that inwas out of town and my wife called because the garage door wouldn't open. We had repairs to the only other exit, and the CS said because it could be opened manually, it was no emergency. She was stuck in the house for over Sixteen hours. No emergency crew came out. Steve, a tech who came out the first time, fixed the door. It is not his fault CS took their sweet time to help a 45 year customer. I commend Steve. I do NOT have anything good to say about CS.
The most common question we get over the phone is, "Okay, so how much does it cost to replace garage door springs?" To give you an exact price quote, we would need to know the size of the door, weight, and type of garage door springs needed (torsion or extension). Since we carry over 30 different types of springs to account for all the different types of garage doors, we recommend that a professionally trained technician takes the proper measurements himself before giving you an exact price quote.
Professionals can replace garage door springs in an hour or two. When you hire a pro, make sure to ask about the quality of the springs they will install. They may well offer several grades of springs to choose from, at a range of costs. Top of the line springs may be guaranteed for life, while economy springs can be expected to last perhaps five years under normal use.
Replacement spring procedure took me exactly 1 hours including preparation and clean-up for double aluminum garage door. Watch the DIY video on Youtube, save $$, be careful with winding the torsion springs. Rule of thumb: 7' height door garage= 7' x 4 (each 1/4 turn) + 1 = 29 turns (1/4 turn), 8' height door garage = 8' x 4 + 1 = 33 turns (1/4 turn), and so on....
What LCD said is more or less right. Those are the ranges you'd typically find you will have to pay, but it's important to remember that the rates vary across the country. One thing I always advice others to do is to get quotes from different contractors. It might not be the biggest job, but you'd be surprised how much difference there typically is in the quoted prices. If you check out the link I put in the resource, it'll take you to a site where you can get quotes from 4 different contractors at once. Under "Select service" you simply pick "Spring Replacement".
The winding and unwinding is done at a metal fitting, called a winding cone, attached to the outside end of the spring. You stick a winding bar into one of the four holes in the cone and use the bar as a lever to turn the cone. Once you've completed a quarter turn, insert the other bar into a different hole in the cone and let the bar lever against the closed garage door to hold the spring tension. This allows you to move the original bar to repeat the process, alternating the bars with each quarter-turn. It takes about 30 quarter-turns to fully tension a standard torsion spring.