Abstract: For disassembly purposes, a holder holds the bearing assembly of a spindle assembly so that a free end of the spindle of the spindle assembly extends upward from the bearing assembly. A guide aligns a disassembly striker with the free end of the spindle and the disassembly striker drives the spindle at least partially through the bearing assembly. The holder defines a lower collection chamber that the spindle falls into. For assembly purposes, the holder holds the bearing assembly and the spindle so that the spindle extends through the bearing assembly and the free end of the spindle extends upward from the bearing assembly. The guide aligns an assembly striker with the spindle and a collar that encircles the spindle. An internal surface of the assembly striker includes a annular first portion that abuts the collar. The assembly striker drives the collar onto the spindle until a stop arrests movement of the assembly striker and the collar.