The locking mechanism may be responsive to movement of the actuator knob to maintain the tool within the output shaft when the actuator knob is in the lock position and permit {HEAD ~ removal} of {TAIL ~ the tool} when the actuator knob is in the unlock position 
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The locking mechanism may be responsive to movement of the actuator knob to maintain the tool within the output shaft when the actuator knob is in the lock position and permit { HEAD ~ removal } of { TAIL ~ the tool } when the actuator knob is in the unlock position
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