Patent ID: 7802501

Claim:
A stabilizer for a workpiece being held in a multi-jaw chuck, said stabilizer comprising a) a generally cylindrical body portion at least partially insertable in a central opening in the chuck, said body portion having a length, a first end, a second end, and a side wall extending throughout said length between said first end and said second end, openings being formed in said side wall to form thin-walled regions there between; b) an aperture extending through said length of said body portion, at least a portion of which is internally threaded; c) a cylindrical rod being at least partially threaded on its exterior surface with a thread compatible with said internally threaded portion of said aperture; d) at least one member having a stabilizing surface for engaging the workpiece as it is held in the multi-jaw chuck to prevent its axial movement during machining; e) a nut having an internally threaded surface which receives said cylindrical rod, f) expander means having a tapered outer surface, at least a portion of which is received within said aperture; whereby when said nut is tightened upon said cylindrical rod in said aperture, said expander means causes said thin-walled regions to flex outwardly securing said body portion within the central opening of the multi-jaw chuck.