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.
11.2b If the springs you installed are too strong, and if you wind the springs the correct number of turns, the door will not stay down nor half way. The garage door will be hard to close. DO NOT REMOVE MORE THAN HALF A TURN OF SPRING TENSION TO CORRECT THE PROBLEM. Here's why. If you remove 3/4 of a turn to get the door to stay closed, and then if you open the door, it will get heavier as you open the door, and once open, the cables will come off the drums. This could create as much as a day's extra work. It could also cause door damage and/or result in serious injury. Do not use the door! Get different springs!
Torsion springs do not last forever, regardless of what some companies claim. “Lifetime” springs do not exist – all springs have a lifespan. Most builders typically install the lowest costing door available and with that generally comes lower cycle springs. A torsion spring’s life is determined by the number of cycles the spring is rated to last. Whenever the door goes up and down is what is referred to as a “cycle.” The springs that builders install can last as little as 7,500 cycles which means the average homeowner could get 3-5 years of life. http://y2u.be/Z_eZc-kh40c