As with 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 {TAIL ~ assembly} or {HEAD ~ disassembly} as desired 
As with 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 { TAIL ~ assembly } or { HEAD ~ disassembly } as desired
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH