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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. Common torsion springs are used in clothes pins, clipboards, swing-down tailgates and garage doors. Torsion springs are used for hinges, counterbalances and lever return applications. Sizes range from miniature, used in electronic devices, to large torsion springs used in chair control units to push them back to their original position.