Use a scouring pad  to remove light rust and dirt. Use a soft stone  to repair small dings or high spots on the taper. Clean the toolholder with a lint-free cloth. Examine cutting tools to make sure that they are not worn or damaged . Inspect the retention knob  (pull stud) for damage, wear, and proper torque.
Toolholder Damage from a Broken Retention Knob
To help protect the spindle taper from damage, refer to the VMC - Spindle - Taper - Maintenance procedure.
**The recommended intervals to apply grease to the retention knobs are based on the average user. Adjust your maintenance schedule as needed to keep the retention knobs properly greased.