Since the hubs 24 are preferably of plastic, they are yieldable and a tool 50 can be inserted in the central hole reserved for the bolt 30, the tool 50 can be inserted in the hole and twisted through an angle of 90???, at which time the hubs will flex and, in this position of the bearing, as shown in FIG. 5, the bearing can be lifted with the fingers or another tool, such as pliers or the like.