Spindle bearing spacer

A proper rotor with no damage and properly adjusted bearings needs no such thing. The spindle nut, the companion cap and pin and washer, you adjust the bearings for proper pre-load. They are ALWAYS under a slight tension end-to-end, or maybe I should say compression. This should not change, and never has been known to be a problem. IF IT IS (a problem) there is likely something wrong--with a bearing, with the machining in the rotor, whatever