I went on Garage Door Nation website to look at the conversion chart from 1 to 2 torsion springs. For my 1 spring, size 2"/0.250ID/30.5" length, they recommended 2 of 2"/0.207ID/24" length. I got this kit from Amazon for $64 with $11 overnight shipping even though I could get free shipping through Prime over the weekend, but I couldn't wait for 3 more painful days. Installed it followed YouTube video. Worked better than my old one, a lot quieter. Check the video if you want to install one yourself. Professional installation costs hundreds of $$$:

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We arrived at a rental property and tried to open garage door to get our vehicle in so we could unload luggage, etc. Could not open from outside. Went into house and, from inside garage, tried automatic opener but this did not work. So in trying to open the door manually, I reached up and pulled on the red cord attached to a lever. What I could not see, and was not expecting, is that the rope was frayed through almost completely. The rope broke when I applied some weight to it, sending me backwards onto the floor of the garage.
One thing to consider - assuming you have 2 springs and an opener, unless the other spring is quite new, you should replace it at the same time, first because it will probably break fairly soon anyway and changing two is only about $50 more than changing one, and because the springs on both sides should be of equal stiffness - if not, then the door will be unevenly weight compensated and try to open cockeyed, increasing wear and risk of damaging the motor.

The following instructions for replacing garage door springs are for do-it-yourself homeowners and for maintenance repair men who service their smaller commercial or industrial sectional overhead doors. These directions are designed for torsion springs mounted to both sides of an anchor bracket above the middle of the garage door as pictured above. Instructions for replacing a single torsion spring, for replacing garage door extension springs, and for replacing Wayne Dalton Torquemaster springs are linked to our DIY Instructions page above. You'll also find a link for any other garage door parts you may need while repairing your door.
On our EZ-Set Torsion Springs page you will find several options for replacing these springs. We also have step by step instructions for EZ-Set Torsion Spring Replacement. In addition, one of our customers has provided excellent EZ-Set Torsion System instructions for removing the spring without wrecking the winding unit that secures the stationary cone. Instead of a spanner tool, you may prefer to use a pipe wrench or large channel locks to hook the end of the spring and remove it from the cones in the last step.

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10.4 Raise the second bar 90 degrees and insert the first bar. This is "three." Continue winding. If the spring shortens in length, unwind the spring and switch sides - the springs are on backward. Otherwise, continue winding until you reach a count of "30." This is 7 1/2 turns, which is normal for most 7' doors. Longer life springs are wound the same number of turns. Newer steel doors with only one strut on top often need only 7 1/4 turns. On 8' doors count to 34. Each time you insert a bar into the winding cone, listen for the click to let you know the bar is in all the way. Not inserting the bar all the way could cause the cone to explode. http://www.youtube.com/watch?v=Z_eZc-kh40c&feature=kp
Usually, when a garage door spring breaks the door has already closed or come down. In some instances, however, a spring can snap while the door is closing or in motion, causing the door to fall rapidly. In these situations, the door can become a safety concern for you and your family, so you should keep your distance and call a garage door professional as soon as possible. Garage doors are very heavy and can cause injury if not handled properly. When a garage door problem occurs, call a Sears Garage Door expert to help. http://www.youtube.com/e/Z_eZc-kh40c?app=desktop
A garage door with aging springs puts an enormous load on a garage door opener, so another sign of failing springs is when you hear the electric door opener begin to strain as it attempts to lift the door. At this point, it is time to consider replacing the springs. Aging door springs can also break suddenly, a situation that can cause the door to slam shut violently. If you happen to be present when a spring breaks, you will hear a very loud sound like a gunshot, because the break usually occurs when the spring is fully loaded—stretched or twisted to its full tension. When one spring breaks, the door will suddenly feel very heavy when you try to open it by hand, and an automatic garage door opener may no longer be able to lift the door at all.
If the track is misaligned, but the door still moves, there are a few things you can do to attempt to remedy the issue on your own. You’ll know that it’s misaligned if you hear a rubbing noise when the garage door reaches a certain spot on the tracks each time it opens and closes. Sometimes the door may even slow down slightly when it hits this spot.
If you have decided to replace your springs, if you are sure your door had the correct springs, and if you are ready to buy new ones, we recommend that you measure your spring or springs following the instructions in Step 4 below. Measuring springs can be difficult; most individuals, even garage door technicians, sometimes have difficulty measuring torsion springs. Ordering incorrect springs wastes time and money.
R-value describes the power of the insulation in your door. The higher the r-value, the stronger the insulation. Those doors will have better energy efficiency than doors that have a low r-value. Basic doors have an r-value of 0.0 with no insulation. The first step up gives you 1-3/8” insulation at a 6.5 rating. Next, a 1-3/8” thickness with Intellicore has a 12.9 r-value. The best option on the market is the 18.4 r-value, which has 2” Intellicore insulation.
The new opener was installed yesterday and today for a while it wouldn't close properly. The customer service representative said they will probably have to reverse the sensors. However, no one could come out today (Friday) or tomorrow. She will call me by Tuesday of next week to schedule someone to come here. The customer service rep. and the technician were nice but as of now, my new garage opener is not working to my satisfaction.
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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Started in 2004, Aladdin Garage Doors has become known nationwide as the trusted source for garage doors, repairs, and fast, efficient service. With a mission focused on delivering outstanding customer care, we’re proud to offer garage doors that lead the industry in quality, value, and lifetime protection for homes and businesses. Whatever your garage door needs may be, you can count on Aladdin Garage Doors to offer: https://www.youtube.com/attribution_link?a=Z_eZc-kh40c&u=%2Fwatch%3Fv%3DXXXXXX%26feature%3Dshare
Squealing, screeching, or grinding noises from your garage door are usually indicative of a lack of lubricant or an accumulation of dirt or debris in the tracks. When removing debris, do not use harsh chemicals to clean the tracks. Once the track is clean, coat it with lubricant designed especially for garage doors, if possible. If you do not have access to this special type of lubricant, you can use WD-40 on the tracks and hardware. http://youtube.com/embed/Z_eZc-kh40c
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