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