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