The pressure ensures adequate contact between the covering and {HEAD ~ a counter shaft assembly} which communicates magnetically with {TAIL ~ internal electronic circuitry} 
The pressure ensures adequate contact between the covering and { HEAD ~ a counter shaft assembly } which communicates magnetically with { TAIL ~ internal electronic circuitry }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL