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