The pressure blade ensure {HEAD ~ adequate contact} between {TAIL ~ the advancing cover material} and the outer surface of the counter shaft 
between
The pressure blade ensure { HEAD ~ adequate contact } between { TAIL ~ the advancing cover material } and the outer surface of the counter shaft
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH