The drive element engages {HEAD ~ the top} of {TAIL ~ the foremost fastener} of the strip of fasteners to force the fastener into a work piece 
of
The drive element engages { HEAD ~ the top } of { TAIL ~ the foremost fastener } of the strip of fasteners to force the fastener into a work piece
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH