Spring and archimedes’ screw: what they have in common

1. Step 1. Spring — is part of — Derailleur. A tension spring.
2. Step 2. Derailleur — is part of — Bicycle drivetrain. Derailleurs.
3. Step 3. Bicycle drivetrain — has part — Crank. The cranks turn the motion of the legs into rotation.
4. Step 4. Crank — is part of — Archimedes’ screw. A handle or rotary drive.

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