An apparatus (10, comprising: (a) a body assembly; (b) a shaft comprising a proximal end, and a distal end, wherein the shaft extends distally from the body assembly, wherein the shaft defines a longitudinal axis; (c) an end effector positioned at the distal end of the shaft; (d) a rotation input feature comprising a proximal end and a distal end, wherein the rotation input feature is configured to rotate one or both of the shaft assembly or the end effector about the longitudinal axis; and (e) a locking feature configured to transition between a locked state and an unlocked state, wherein the locking feature is configured to prevent rotation of the one or both of the shaft assembly or the end effector when the locking feature is in the locked state, wherein the locking feature is configured to permit rotation of the one or both of the shaft assembly or the end effector when the locking feature is in the unlocked state; and characterized in that the rotation input feature further comprises a cam slot ; wherein the shaft further comprises a set of teeth ; wherein the locking feature further comprises: (i) a rotation lock having a set of teeth configured to engage the teeth of the shaft , wherein the rotation lock is resiliently biased to provide engagement between the teeth of the rotation lock and the teeth of the shaft , and (ii) a first pin disposed in the cam slot of the rotation input feature , wherein first the pin is in communication with the rotation lock, wherein the rotation input feature is rotatable to drive the first pin to thereby disengage the teeth of the rotation lock from the teeth of the shaft , thereby transitioning the locking feature to the unlocked state. (a) a body assembly; (b) a shaft comprising a proximal end, and a distal end, wherein the shaft extends distally from the body assembly, wherein the shaft defines a longitudinal axis; (c) an end effector positioned at the distal end of the shaft; (d) a rotation input feature comprising a proximal end and a distal end, wherein the rotation input feature is configured to rotate one or both of the shaft assembly or the end effector about the longitudinal axis; and (e) a locking feature configured to transition between a locked state and an unlocked state, wherein the locking feature is configured to prevent rotation of the one or both of the shaft assembly or the end effector when the locking feature is in the locked state, wherein the locking feature is configured to permit rotation of the one or both of the shaft assembly or the end effector when the locking feature is in the unlocked state; and characterized in that the rotation input feature further comprises a cam slot ; wherein the shaft further comprises a set of teeth ; wherein the locking feature further comprises: (i) a rotation lock having a set of teeth configured to engage the teeth of the shaft , wherein the rotation lock is resiliently biased to provide engagement between the teeth of the rotation lock and the teeth of the shaft , and (ii) a first pin disposed in the cam slot of the rotation input feature , wherein first the pin is in communication with the rotation lock, (i) a rotation lock having a set of teeth configured to engage the teeth of the shaft , wherein the rotation lock is resiliently biased to provide engagement between the teeth of the rotation lock and the teeth of the shaft , and (ii) a first pin disposed in the cam slot of the rotation input feature , wherein first the pin is in communication with the rotation lock, wherein the rotation input feature is rotatable to drive the first pin to thereby disengage the teeth of the rotation lock from the teeth of the shaft , thereby transitioning the locking feature to the unlocked state. <EOS>