As with {TAIL ~ trough} 8 of the aforementioned embodiment, trough 28 is made of a like material which exhibits a moderate degree of resiliency, allowing the opposed sides of trough 28 to be spread apart sufficiently to allow flanges 27 to be inserted into, or removed from, rectangular holes 29, simplifying assembly or {HEAD ~ disassembly} as desired 
As with { TAIL ~ trough } 8 of the aforementioned embodiment , trough 28 is made of a like material which exhibits a moderate degree of resiliency , allowing the opposed sides of trough 28 to be spread apart sufficiently to allow flanges 27 to be inserted into , or removed from , rectangular holes 29 , simplifying assembly or { HEAD ~ disassembly } as desired
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