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Torsion springs are coils that
are twisted (rather than pulled) to store energy.
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Large coiled torsion springs are used to counter-balance the weight of garage doors.
Great care must be exercised when adjusting these as they store a large amount of mechanical energy.
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Small coiled torsion springs are often used to operate small pop-up doors such as are found on small consumer goods such as digital cameras
and compact disk
players.