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