Rotary dial and rock drill: what they have in common

1. Step 1. Rotary dial — has part — Spring. A return spring.
2. Step 2. Spring — is part of — Shock absorber. The spring carries the car's weight while the damper stops it bouncing.
3. Step 3. Shock absorber — has part — Piston. Inside, a piston moves in oil.
4. Step 4. Piston — is part of — Rock drill. A percussion piston.

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