13. The hub and bearings are held on the spindle with a combination of an adjusting nut, a lock ring, and a locknut. The two nuts thread onto the spindle, while the lock ring goes in between them and is kept in place with a groove and tab in the spindle. The adjusting nut goes up against the outer wheel bearing; some adjusting nuts have a small pin that lines up with holes in the lock ring. Other lock rings have flanges that are pounded over on the nuts to keep them from moving.