The top cover of the improved assembly has an integral pressure blade which extends downward to apply {HEAD ~ pressure} to {TAIL ~ the cover material} 
The top cover of the improved assembly has an integral pressure blade which extends downward to apply { HEAD ~ pressure } to { TAIL ~ the cover material }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL