"Turntable 30 rests on three wheels 108, 110, 112, each of which wheels is shod with a resilient tire 114, that may be an o-ring of neoprene, rubber, nitrile (Buna-N, a copolymer of butadiene and acrylonitrile), silicone, EPDM, Butyl or other suitable material." . . . . .