first and second end caps formed with tangs providing an interference fit with the walls of {HEAD ~ said central groove} of said channel to secure {TAIL ~ said first and second end caps} to said first and said second ends of said channel, respectively 
to secure
first and second end caps formed with tangs providing an interference fit with the walls of { HEAD ~ said central groove } of said channel to secure { TAIL ~ said first and second end caps } to said first and said second ends of said channel , respectively
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH