Gas block and needle: what they have in common

1. Step 1. Gas block — is part of — Assault rifle. It bleeds powder gases onto the piston.
2. Step 2. Assault rifle — has part — Spring. A return spring.
3. Step 3. Spring — is part of — Automaton. The mainspring stores the energy.
4. Step 4. Automaton — has part — Cam. Cams set the figures’ movements.
5. Step 5. Cam — is part of — Sewing machine. Cams drive the fabric feed.
6. Step 6. Sewing machine — has part — Needle. A needle with the eye near its point.

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