Sewing machine shuttle and windlass: what they have in common

1. Step 1. Sewing machine shuttle — is part of — Sewing machine. The shuttle forms the stitch.
2. Step 2. Sewing machine — has part — Crank. A crank turns rotation into the stroke of the needle.
3. Step 3. Crank — is used in — Windlass. The handle of a windlass is a crank.

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