The housing may have an interior in or through which the point of contact surface may be accessed and an anterior opening for {HEAD ~ access} to {TAIL ~ the interior} 
to
The housing may have an interior in or through which the point of contact surface may be accessed and an anterior opening for { HEAD ~ access } to { TAIL ~ the interior }
OTH OTH OTH OTH OTH OTH 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