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