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