When {TAIL ~ the tool} is applied to a fastener, a bias load is applied along the axis of the tool and the drivetrain assembly 71 translates rearward compressing the spring and contacting {HEAD ~ the pushbutton} 
When { TAIL ~ the tool } is applied to a fastener , a bias load is applied along the axis of the tool and the drivetrain assembly 71 translates rearward compressing the spring and contacting { HEAD ~ the pushbutton }
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD