Related Clues:

• Shaft on which wheels rotate
• Bar on a bus
• Revolutionary device?
• Yo-yo part
• See 5
• See 9
• See 8
• Archetypal invention with list
• A revolutionary invention the Incas never had
• It helps to keep the rotor turning, as chopper hovers over Laotian capital
• Student breaks tool making a spindle
• Turning point in a revolution
• Point cad's revolver
• Shaft unknown in drink
• Turning point in tax legislation