A medical instrument handle assembly, for holding a medical instrument configured for preparing a bone to receive an implant, includes: a housing including a housing pin； an elongate arm including a proximal end； a lever subassembly including a lever body and a lever latch, the lever body being pivotally connected to the proximal end of the elongate arm, the lever body and the lever latch being pivotally connected to one another and thereby being selectively positionable relative to one another between a first position and a second position, the first position being when the lever body and the lever latch are clamped about the housing pin, the second position being when the lever body and the lever latch are unclamped relative to the housing pin.
