This ensures that when nut 23 is rotated in {HEAD ~ a first direction} , valve stem threads 436 can not mate with {TAIL ~ braze body internal threads} 61 
This ensures that when nut 23 is rotated in { HEAD ~ a first direction } , valve stem threads 436 can not mate with { TAIL ~ braze body internal threads } 61
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH