A spring 72 of adequate stiffness biases {HEAD ~ the drivetrain assembly} 71 forward in {TAIL ~ the tool housing} 
forward in
A spring 72 of adequate stiffness biases { HEAD ~ the drivetrain assembly } 71 forward in { TAIL ~ the tool housing }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL