The 900 Series Doctor Preload Bearing Adjustment Tools from Temper Axle Products Corporation lets technicians adjust bearings to light preload settings with consistency from technician to technician and from shop to shop, ensuring accuracy of the final settings and increased speed start to finish. A circular keyfinder simplifies mounting of the Doctor Preload tools on the axle spindle end. Hash marks laser etched with precision on the circumference of the keyfinder take the guesswork out of aligning the Temper-Loc nut to lock in the final bearing setting. Other modifications overcome the normal variations in wheel end components such as bearing dimensions and hub styles.