Spent a “few” minutes looking for an extra collet nut replacement today. My current part is fine, I wanted to get an extra one or two so I can replace the collet with some different sizes found on ol Amazon.
Part # 201389001
Direct link to part if you don’t have/like/use/etc Amazon
Removing the retainer ring on mine ,it has about 2.5/3 wraps around the collet, and just use a very thin blade (I used razor blade) to get the first ring out of the track and then just work it off. Easier then I thought!
Still, I’m Looking forward to getting a couple extra nuts so I won’t need to spend time changing collets out of the nut .