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Basically, the springs are attached on one end(center) and torques the bar on either side. The pullys attached to the bar ends wind up the cables/door.
-So, starting from scratch with all parts new and in place, you'd first draw a white paint line across the spring so you can count how many turns have been put on it.
-Raise the door all the way up and as far back as possible and clamp some vice grips on each track so the door doesn't move forward.
-Wind the cables around the pullys on both sides and then bolt the pullys to the bar evenly.
If a cable gets loose you have to start over from scratch so make sure they are even and line up vertically. Use a vice grip resting against the wall/other so the bar doesn't move while doing each side.
-Loosen the spring end-bolts. Using two short bars, that fit perfectly(!) in the holes, wind each spring up and tighten both bolts. Check, and repeat.
If the old and new springs are the same specs, use the old number of turns as a guide.
If a turn bar slips out, the other will either break your hand, tear out an eye socket, or the whole thing will unravel in a furious way.
Have a solid tall ladder, no long hair/etc,good light and and good tools.
-For adjustment, make sure each spring has the same amount of turns and watch the in/out movenment of the rollers for signs of kinking. A good adjustment is when the door closes halfway.
My advice would be to call a professional. That job was when I permanently threw out my back and I'm glad to have good bone density.
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Meanwhile other things are still happening.
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