hand nut

Loosening another hand nut allowed the handlebars to be rotated 90 degress so they would fit snugly against the side of the bike.

The left hand nut will undo by turning the nut toward you, the right hand one will undo by turning it away from you.

A simple example is found in a fixed-spool fishing reel, where the slipping torque is set by means of a large hand nut in order that the reel will turn and allow more line to unwind before the line breaks under the pull of a fish.

The folding mechanism for the steering, unique to the Bootie, comprises a solid steel, two-part hinge fitted between separate upper and lower steerer tubes.The hinge was secured in position with a hand nut of the type used to secure the wheels of many racing bicycles of the era.