IV drip and windlass: what they have in common

1. Step 1. IV drip — has part — Syringe. A needle.
2. Step 2. Syringe — has part — Needle. A hollow needle.
3. Step 3. Needle — is part of — Sewing machine. A needle with the eye near its point.
4. Step 4. Sewing machine — has part — Crank. A crank turns rotation into the stroke of the needle.
5. Step 5. Crank — is used in — Windlass. The handle of a windlass is a crank.

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