Radiator and micrometer: what they have in common

1. Step 1. Radiator — is part of — Internal combustion engine. The cooling system.
2. Step 2. Internal combustion engine — is part of — Outboard motor. A combustion engine.
3. Step 3. Outboard motor — has part — Worm gear. An angle gearbox.
4. Step 4. Worm gear — uses — Screw. The worm is a screw.
5. Step 5. Screw — is used in — Micrometer. A precise screw with a 0.5 mm pitch.

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