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  1. It works well, though, and allows for a lot of height adjustability. Well, all-round adjustability.

  2. Clever, it’s basically a clutch design TIL. Static and movable washers layered to increase friction.

  3. The penticlip’s multiple washers function similarly as a muktiplate clutch, in that multiple plates in compression can hold against torque effectively (resistance to slipping is greater, per compressive force, for multiple plates in compression).

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