SafetyGarage doors with extension springs would normally be installed with a restraint cable running through the center of these springs. This is necessary because the springs weaken from the fatigue and stress exerted on the steel wire from opening and closing the door. If an extension spring breaks, it can seriously injure anyone present in the garage or damage adjacent property. The cable running through the center restrains the spring in the event of a failure.
Most overhead garage doors are equipped with torsion springs which do not need safety restraint cables since the torsion shaft running through the springs restrains the spring if it breaks. Torsion springs are superior to extension springs since they are easier to fine tune and balance the weight of the door more evenly.
The bottom roller brackets located at the bottom corners of the door are always under extreme tension since the counterbalance cables are attached to these brackets. Therefore, one should never attempt to remove or loosen the screws that attach these brackets to the door as serious injury can result. This also applies to other spring hardware such as the setscrews, cable drums, lag screws, center bearing plate, etc. From Wikipedia.
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Garage Door Repair
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