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