a housing endwall stop on {TAIL ~ the housing jig} at {HEAD ~ the first end} thereof, the second end of the housing jig being open, 
a housing endwall stop on { TAIL ~ the housing jig } at { HEAD ~ the first end } thereof , the second end of the housing jig being open ,
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH