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The active coils are what makes a spring a spring. To count spring coils, it is important to understand what is and is not, an active coil. The active term is generally applied to any portion of a spring that stores and releases energy. In the case of a compression spring, the active portion will expand as the spring is compressed. The opposite is typical of an extension spring. The action of a clutch spring tightening down on a shaft is typical of diameter change as a torsion spring winds up.