A surgical instrument (10; 50), comprising: a housing assembly including an actuator, the actuator including a moveable handle and a trigger ; an elongated shaft assembly (16; 74) defining a longitudinal axis and extending from the housing assembly, the elongated shaft assembly including an interior control member operatively coupled to the actuator, and an outer cover (32; 54; 90) including first and second cover members and a hinge (90c; 68) coupling the first and second cover members to one another such that the outer cover may be selectively moved between a closed configuration wherein the interior control member is enclosed within the outer cover and an open configuration wherein the interior control member is exposed, the interior control member including: a first control member operatively (104; 138; 162) coupled to the moveable handle; and a second control member operatively coupled to the trigger; and a detachable end effector (14; 264) supported at a distal end of the elongated shaft assembly, the end effector operatively associated with the interior control member and has a proximal end including: a first drive member detachably coupled to a distal end of the first control member by a complementary undulating trapezoidal profile (36; 42); and a second drive member extending proximally from the first drive member, the second drive member detachably coupled to a distal end of the second control member by a complementary undulating trapezoidal profile (38; 44). a housing assembly including an actuator, the actuator including a moveable handle and a trigger ; an elongated shaft assembly (16; 74) defining a longitudinal axis and extending from the housing assembly, the elongated shaft assembly including an interior control member operatively coupled to the actuator, and an outer cover (32; 54; 90) including first and second cover members and a hinge (90c; 68) coupling the first and second cover members to one another such that the outer cover may be selectively moved between a closed configuration wherein the interior control member is enclosed within the outer cover and an open configuration wherein the interior control member is exposed, the interior control member including: a first control member operatively (104; 138; 162) coupled to the moveable handle; and a second control member operatively coupled to the trigger; and a first control member operatively (104; 138; 162) coupled to the moveable handle; and a second control member operatively coupled to the trigger; and a detachable end effector (14; 264) supported at a distal end of the elongated shaft assembly, the end effector operatively associated with the interior control member and has a proximal end including: a first drive member detachably coupled to a distal end of the first control member by a complementary undulating trapezoidal profile (36; 42); and a second drive member extending proximally from the first drive member, the second drive member detachably coupled to a distal end of the second control member by a complementary undulating trapezoidal profile (38; 44). a first drive member detachably coupled to a distal end of the first control member by a complementary undulating trapezoidal profile (36; 42); and a second drive member extending proximally from the first drive member, the second drive member detachably coupled to a distal end of the second control member by a complementary undulating trapezoidal profile (38; 44). <EOS>