A surgical tool attachment (170, 320, 410, 650, 740, 840), said attachment comprising: a housing (174, 322, 652, 742); a head tube (172, 172a, 330, 614, 743) that extends forward from the housing; an input drive shaft (192, 336, 414, 658, 744) rotatably coupled to the housing; an output drive shaft (214, 426, 774) that is separate from the input drive shaft, said output drive shaft being rotatably mounted in the head tube, the output drive shaft having a bore (228, 442, 790) for receiving a cutting accessory; a holding member (246, 808) attached to said output drive shaft, said holding member being positioned to selectively seat in the bore of said output drive shaft for releasably holding the cutting accessory in the bore; and a locking member (240, 454, 814) disposed over the output drive shaft for releasably engaging said holding member; characterized in that: a push rod (262, 366, 480, 756, 842) extends through the head tube, said push rod being: coupled to the input drive shaft to rotate in unison with the input drive shaft and to move longitudinally relative to the input drive shaft; coupled to the output drive shaft to rotate in unison with the output drive shaft; and connected to the locking member so that the longitudinal movement of said push rod moves the locking member from a first position in which the locking member abuts the holding member to a second position in which the locking member is spaced from the holding member; and a external control member (288, 386, 632) moveably mounted to the housing, said external control member being coupled to said push rod so as to cause longitudinal displacement of said push rod so that said push rod displaces said locking member from the first position to the second position. a housing (174, 322, 652, 742); a head tube (172, 172a, 330, 614, 743) that extends forward from the housing; an input drive shaft (192, 336, 414, 658, 744) rotatably coupled to the housing; an output drive shaft (214, 426, 774) that is separate from the input drive shaft, said output drive shaft being rotatably mounted in the head tube, the output drive shaft having a bore (228, 442, 790) for receiving a cutting accessory; a holding member (246, 808) attached to said output drive shaft, said holding member being positioned to selectively seat in the bore of said output drive shaft for releasably holding the cutting accessory in the bore; and a locking member (240, 454, 814) disposed over the output drive shaft for releasably engaging said holding member; characterized in that: a push rod (262, 366, 480, 756, 842) extends through the head tube, said push rod being: coupled to the input drive shaft to rotate in unison with the input drive shaft and to move longitudinally relative to the input drive shaft; coupled to the output drive shaft to rotate in unison with the output drive shaft; and connected to the locking member so that the longitudinal movement of said push rod moves the locking member from a first position in which the locking member abuts the holding member to a second position in which the locking member is spaced from the holding member; and a external control member (288, 386, 632) moveably mounted to the housing, said external control member being coupled to said push rod so as to cause longitudinal displacement of said push rod so that said push rod displaces said locking member from the first position to the second position. a push rod (262, 366, 480, 756, 842) extends through the head tube, said push rod being: coupled to the input drive shaft to rotate in unison with the input drive shaft and to move longitudinally relative to the input drive shaft; coupled to the output drive shaft to rotate in unison with the output drive shaft; and connected to the locking member so that the longitudinal movement of said push rod moves the locking member from a first position in which the locking member abuts the holding member to a second position in which the locking member is spaced from the holding member; and a external control member (288, 386, 632) moveably mounted to the housing, said external control member being coupled to said push rod so as to cause longitudinal displacement of said push rod so that said push rod displaces said locking member from the first position to the second position.