Air Turbine ??
I'm looking at one I saw at IMTS show in Chicago last week. Made by airturbinetools dot com.
Model 730MX 40K RPM ( ER11 - 1/4" COLLET ) my choice. Model # 70002, I think.
Less than $800. My use will be light duty, so I think quality of this one is excellent.
Held one in my...