Almost 20 years ago, I helped a gentleman named Harry Roberts create operating, brass O gauge rotary dump units. Harry died in 1992 and left me with parts to make many of these dumps sitting around my shop, which I have recently found. If anyone out there would like them, for the cost of postage and the value of the brass, they are welcome to them. I have many end wheels, some cross beams and a couple of the sheet metal parts shown in one of the attached drawings. The wheels are the tough one to make...took a bit of time / programming on my CNC mill to get it just right to make Harry happy. I am getting ready to cast some brass parts at my foundry, and if nobody wants these things, they will become steam pumps for my current live steam project. I also have some left-over chain, rollers, gear-motors and aluminum baseplates if anyone is interested.