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