I ruined (fretted) the spindle on my Clausing 8530 Mill. It all started when it became difficult to release my collets from the drawbar. I keep a brass hammer handy to pound the acorn nut atop the drawbar. To remedy (besides ensuring spindle clean and oiled), I didn't tighten the drawbar nut as tight as I should have, thinking I was overtightening it and contributing to the difficulty to release the collet. While milling, the collet became loose and spun around for a few seconds inside the spindle, which was long enough to produce extensive fretting inside the spindle and on the MT2 collet. Now I don't know what to do. Extensive searches on the Internet reveal no information on corrective action. One person said to use some sort of scraper on a different forum. Perhaps I don't need to do anything at all since the mill is still working? Your feedback would be great.