Torsion springs are helical springs that exert a torque or rotary force. The ends of a torsion spring are attached to other components, and when those components rotate around the centre of the spring, the spring tries to push them back to their original position. They can store and release angular energy or statically hold a mechanism in place by deflecting the legs about the body centreline axis. They resist twist or rotationally applied force. Depending on the application, a torsion springs can be designed to work in a clockwise or anti clockwise rotation, thus determining the direction of the wind.