A surgical tool and method of operation are provided. The surgical tool includes an end effector, such as a surgical scissor. The end effector is coupled to an actuating mechanism having a clevis and a pulley. A cable engages the pulley and is attached to one side of the clevis. When one portion of the cable is pulled, the clevis is moved in a first direction causing the end effector to open. When a second portion of the cable is pulled, the clevis moves in the opposite direction and the end effector is closed. The system also includes a mechanism for changing the orientation of the end effector. Another embodiment includes a mechanism for actuating the cable and the end effector.
