Castle LB-23 Diagnostics Manual - Manual (Page 6)

3. To replace bits use a 3/32 allen wrench to loosen the set screw in the bottom collar of the spindle.
4. Remove the old bit by pulling down on it while grasping it firmly.
5. Do the reverse to install. Make sure that the flat part of the bit shank is aligned with the set screw
for tightening.
Revised 2/9/2007