a body having a cam housing portion and a shaft housing portion;

a camshaft mounted for rotation in said body about a rotational axis and having a cam in said cam housing portion, said cam having a cam surface extending about the rotational axis at non-uniform radial distances from the rotational axis;

shafting extending along a longitudinal axis and mounted for reciprocation in said shaft housing portion of said body along said longitudinal axis, said shafting having a proximal end portion having a cam follower surface engageable with said cam, said shafting having a distal end portion including a cutter, said shafting comprising a cutter drive shaft and a cutter shaft;

said cutter drive shaft having a proximal end portion defining said cam follower surface and a distal end portion;

said cutter shaft having a proximal end portion and a distal end portion including said cutter; and

a connector selectively engaged between said distal end portion of said cutter drive shaft and said proximal end portion of said cutter shaft to selectively maintain a connection between said cutter drive shaft and said cutter shaft; and

wherein said shaft housing portion includes a wall defining an opening extending transversely therethrough, said opening positioned in general alignment with said connector to provide access to said connector to allow selective disengagement of said connector from between said distal end portion of said cutter drive shaft and said proximal end portion of said cutter shaft and disconnection of said cutter shaft from said cutter drive shaft; and

wherein said connector is positioned within aligned openings in said distal end portion of said cutter drive shaft and said proximal end portion of said cutter shaft to maintain said connection between said cutter drive shaft and said cutter shaft.