{TAIL ~ The upper end} is optionally secured to {HEAD ~ the open lower end} of the T shaped two piece housing 
{ TAIL ~ The upper end } is optionally secured to { HEAD ~ the open lower end } of the T shaped two piece housing
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH