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