A variant or related form referring to the peg or attachment point of a watch or timepiece; the staff or pivot on which a mechanism turns.
From 'fusty' or 'fust' possibly related to Old French 'fuste' (wood, shaft), referring to the wooden or metal shaft in a mechanical device.
Technical terms from horology (watchmaking) like 'fustee' show how specialized crafts develop their own vocabularies, and many of these terms remain obscure unless you're actually building watches.
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