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