A surgical instrument has a motor housing with a cylindrical member extending therefrom and has a pin projecting radially from the cylindrical member. A nose piece removably attached to the housing has a circular aperture which receives the cylindrical member and which has a channel within which the pin slides during attachment and removal. The nose piece includes a cantilevered arcuate spring arm that urges the pin along the channel toward a position at which the pin is wedged against a wall of the channel to force the nose piece into an operating engagement with the motor housing and retains the pin in the channel resisting detachment.
