Joystick and bicycle: what they have in common

1. Step 1. Joystick — has part — Spring. They return the stick to the centre.
2. Step 2. Spring — is part of — Derailleur. A tension spring.
3. Step 3. Derailleur — is part of — Bicycle drivetrain. Derailleurs.
4. Step 4. Bicycle drivetrain — is part of — Bicycle. The drivetrain transfers the force of the legs to the rear wheel — the main difference from a kick scooter.

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