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