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