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Never repaired a torsion spring in a box truck but its basically the same thing.....as a residental garage door. Only difference is that some of the  parts are welded together and they are smaller. Here are some Photos: more »

Garage Door SpringsOil Tempered Wire vs. GalvanizedBy Walt WellerI had the good fortune of becoming involved in the garage door industry in 2003 when my partner and I acquired General Spring LLC. It didn’t take long before we began to hear abou… more »

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This is a short clip showing a stripped gear inside a Chamberlin liftmaster. You can usually tell your gear is stripped in your Liftmaster or Craftsman motor if you hit the remote control or push button and the motor is turning but your door won't go up.… more »