An adapter assembly for selectively interconnecting an end effector that is configured to perform a function and a surgical device that is configured to operate the end effector, the adapter assembly comprising: an outer tube having a distal end and a proximal end; a housing secured to the proximal end of the outer tube; and a cable drive assembly supported by the housing and including: a worm gear; a cable gear coupled to the worm gear and rotatable in response to rotation of the worm gear; a capstan coupled to the cable gear and rotatable in response to rotation of the cable gear; and a cable coupled to the capstan, the cable axially translatable in response rotation of the capstan to actuate a function of the end effector while connected to the distal end of the outer tube, characterised in that the cable drive assembly further includes a second worm gear, a second cable gear coupled to the second worm gear, a second capstan coupled to the second cable gear, and a second cable coupled to the second capstan, wherein the second cable is axially translatable in response to rotation of at least one of the second worm gear, the second cable gear, and the second capstan, wherein the capstan of the first cable gear defines a slot therein and the capstan of the second cable gear defines a slot therein, said slots (224d, 225d) being configured to selectively receive detents of a rotatable knob therein to enable tension in the cables (240a, 240b) to be adjusted upon rotation of the capstans (224b, 225b) via rotation of rotatable knob. an outer tube having a distal end and a proximal end; a housing secured to the proximal end of the outer tube; and a cable drive assembly supported by the housing and including: a worm gear; a cable gear coupled to the worm gear and rotatable in response to rotation of the worm gear; a capstan coupled to the cable gear and rotatable in response to rotation of the cable gear; and a cable coupled to the capstan, the cable axially translatable in response rotation of the capstan to actuate a function of the end effector while connected to the distal end of the outer tube, characterised in that the cable drive assembly further includes a second worm gear, a second cable gear coupled to the second worm gear, a second capstan coupled to the second cable gear, and a second cable coupled to the second capstan, wherein the second cable is axially translatable in response to rotation of at least one of the second worm gear, the second cable gear, and the second capstan, a worm gear; a cable gear coupled to the worm gear and rotatable in response to rotation of the worm gear; a capstan coupled to the cable gear and rotatable in response to rotation of the cable gear; and a cable coupled to the capstan, the cable axially translatable in response rotation of the capstan to actuate a function of the end effector while connected to the distal end of the outer tube, characterised in that the cable drive assembly further includes a second worm gear, a second cable gear coupled to the second worm gear, a second capstan coupled to the second cable gear, and a second cable coupled to the second capstan, wherein the second cable is axially translatable in response to rotation of at least one of the second worm gear, the second cable gear, and the second capstan,