Abstract: A trolley comprising a trolley body, a shaft fixed on the trolley body and having ends projecting outwardly along the sides of the trolley body and a wheel on each end of the shaft. Each wheel comprises an inner race, an outer race and rollers between the inner and outer races. The inner race having an opening through which the end of the shaft extends. The inner race also has a frusto conical surface adjacent the end of the opening. A conical washer having its outer surface complementary to the frusto conical surface of the inner race is placed adjacent thereto and interengaging means are provided between the washer and the shaft end to prevent rotation therebetween. Each end of the shaft having a threaded opening extending axially therein and a cap screw is threaded into the opening and engages the conical washer to hold the washer against the inner race and relative to the end of the shaft.