Pathway 88 is defined by {TAIL ~ upper surface} 90 of stop 72 and {HEAD ~ a parallel wall section} 92 beneath cover plate 78 
Pathway 88 is defined by { TAIL ~ upper surface } 90 of stop 72 and { HEAD ~ a parallel wall section } 92 beneath cover plate 78
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH