{TAIL ~ An upper housing portion} has an integral pressure blade for exerting {HEAD ~ a constant downward force} on the advancing protective covering 
{ TAIL ~ An upper housing portion } has an integral pressure blade for exerting { HEAD ~ a constant downward force } on the advancing protective covering
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH