Garage Door Torsion springs

Torsion Springs are helical springs that exert a torque or rotary force. The ends of torsion springs are attached to other components, and when those components rotate around the center of the spring, the spring tries to push them back to their original position.

hey are typically cylindrical round wire springs but they can be made out of square, flat or rectangular wire and can be any shape or size.  The legs can be at any position and have virtually any bend twist or loop in them.