Start by disconnecting your garage door from the lift mechanism. This is usually done by pulling on a cord — often with a red handle — that is dangling from the lift. This will allow your door to move independently of your lifting mechanism. It’s also a good thing to know how to do just in case you need to open your garage door when your house doesn’t have power.
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Measure the various areas where the door will be installed: door-opening height and width, headroom (from top of opening to ceiling), and back room (length of garage). For the headroom, you should have about 10" to 12" of space, depending on the spring system you're installing. For the back room, you should have the door height, plus another 18" or more of space.
5.1 With the cables still tight on the drums, mark the drums and torsion shaft at each end with a file or a marking pen. If at least one of the springs is still wound, don't touch the cable drums and don't grab the shaft. If the cable breaks, the drum could spin and the cable rip through muscle and bone. If the set screws aren't tight enough, the shaft could spin and cause injury.
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Luckily, there is a bit of science to questions of garage door repair and replacement. That’s why we’ve put together this guide on when to replace a garage door. We’ll prepare you to compare repair vs replacement garage door costs. We’ll discuss the ways in which repairs are the most affordable option while also exploring those moments when replacement will in the end provide you with more value added.
Whether you need a new garage door spring, a damaged door panel replaced, a new opener installed or a track or rollers replaced, with over 25 years experience in the garage door repair business, I can get it done for you.  Many customers are also happy to know that all the garage door springs I use are not only "Made in the USA", they're made right here in Arizona!  We like to keep things local, and we hope you will do the same when you need a garage door repair for your home.
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.
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