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