Spindle rebuilds and exchanges are available. The 24,000 rpm, 3/8" max capacity, manual collet spindle is

the most common PDA spindle. There is a 24,000 rpm, 1/2" maximum capacity and 1/2" quick change.

There's even a 1/8" drill spindle.

Tool holders in 3/8" O.D. and 1/2" O.D., manual collets, quick change collets, brush housings with

a moving spring loaded brush, idler rollers, spindle drive belts, servo motors, servo amplifiers,

encoders, and limit switches are all available.