Recoil mechanism and zip: what they have in common

1. Step 1. Recoil mechanism — works like — Shock absorber. The same principle of hydraulic damping.
2. Step 2. Shock absorber — has part — Piston. Inside, a piston moves in oil.
3. Step 3. Piston — is part of — Syringe. A plunger.
4. Step 4. Syringe — has part — Needle. A hollow needle.
5. Step 5. Needle — is used in — Trousers. Trousers were sewn with a needle.
6. Step 6. Trousers — has part — Zip. A fastener.

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