thinking about it, the novamill has a slightly different motor, its 5000rpm.

the starmill and novamill have the same column design and size, so a novamill motor would probably fit.

problem with adding a high speed spindle is the angular contact bearings in the head. angular contact bears are open, so when they get warm/hot the lubrication runs out, so they don't last long. to work properly and last long at high speed they need constant lubrication.

ive just replaced the spindle bearings in my denford triac, with lubrication they are rated at 26k rpm. but they aren't lubricated, the stock motor in there only runs at 4000rpm so they will be fine.