Patent ID: 7255020

Claim:
A plunger and interchangeable handle system comprising: a shank shaped to engage a machine tool, said shank including an elongated pin and a threaded adapter, said elongated pin including an engaging tip; a threaded barrel portion defining a plunger recess and including a threaded portion and a biasing spring, said threaded barrel portion being moveably received over said elongated pin such that said elongated pin extends through said plunger recess, wherein said biasing spring urges said engaging tip relative to said threaded barrel portion in a direction away from said threaded adapter; and a plurality of knobs, each of said plurality of knobs having a discrete shape differing from the others of said plurality of knobs, and each of said plurality of knobs including a socket, wherein each of said plurality of knobs is adapted to attach to said shank by engaging said socket with said threaded adapter.