I'd have used a service to wind the overhead torsion spring, but after calling three places, no one could be out until after the 1st. So, 2 perfect diameter grade 8 bolts, 12in long, safty glasses, restrung the cables and started winding, standing off to the side so should I slip they won't hit me in the face, wound her up till the door just started to lift, back it off just a touch, tighten screws and perfect wokring door again. Took about 5 minutes. Didn't even mar the threads on my bolts! Any bigger door than my 2 car, 7 footer though, I don't think I'd want to be winding those things.