Thanks Dean.

Ironically, the top bearing is rated 11K and 13K RPM (oil / grease) but I dont know the number on the lower bearings (they are different). The top bearing is a Nachi 6007ZE (I took the spindle out to measure up a replacement plate but have not yet dropped the spindle out.

Ill take a look at that option. There is a guy on utoob that has converted his Triac to a 2,2 KW Chinese spindle and seems happy with it. Trying to get some further information from him.

At present too on the non isolated version I have, speed control is manual via a pot. Not ideal, will be nice to go 'auto'.