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Set Screw
From WikiPedalia
A screw or bolt threaded into a ring or collar, designed to press against the shaft that the collar surrounds, so that the ring is held solidly against the shaft.
Rings with set screws are used to hold some cartridge bearing hubs and bottom bracket assemblies together.
Some tandem eccentric bottom brackets use set screws to hold the eccentric in position. A very few (mostly antique) bicycles also use set screws to secure the seatpost in the frame.
