{TAIL ~ Slots} 14 include flat reference surfaces 18 machined in {HEAD ~ member} 12 in controlled parallel relationship 
{ TAIL ~ Slots } 14 include flat reference surfaces 18 machined in { HEAD ~ member } 12 in controlled parallel relationship
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH