When you open the garage door, the springs unwind and the tension lifts the door as it turns the shaft. This, in turn, turns the cable drums and wraps the cables around the grooves. When you lower the door, the cables will then unwind and the springs will become unwound, restoring their full tension. Because of their dynamic and dependant nature, it is important that both are working perfectly. If you are experiencing problems with your garage door cables and springs, call us here at All Right Garage Doors.