{TAIL ~ The housing} has a housing rim at a first, free edge of {HEAD ~ the side wall} defining an opening to the cavity 
{ TAIL ~ The housing } has a housing rim at a first , free edge of { HEAD ~ the side wall } defining an opening to the cavity
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH