Capstan-screw definition

A type of screw commonly used to regulate the height of the action in a piano. The capstan screw is designed to be turned from the side, not the head, unlike an ordinary screw. A lever enters a hole in the side of the screw to turn it.
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(nautical) Mainly on sailboats, the mechanism for winding ropes under a lot of tension; a capstan.
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Other Word Forms

Noun

Singular:
capstan-screw
Plural:
capstan-screws