Related Clues:
- Caterpillar wheel part
- Minor but essential part
- Gear piece
- A worm gear lacks it
- Not-so-big wheel?
- Turning tooth in a machine
- Important but sometimes ignored piece
- Firm good for machine gear
- Insignificant worker
- No big wheel at all
- Tooth not examined by a dentist
- Son quietly leaves tooth
- Minor worker takes the tension out of congestion
- Minor player, metaphorically
- Gear that meshes