Using brushes on the GG 3 in

Yesterday I finally decided to use the soft interior brush on my griots garage 3 inch polisher. Installation and use was fine, it was only when I went to remove the brush to clean it there was a problem. It was very tough to remove the brush from the polisher.

If you've ever used one of these brushes you'll see that there are nubs around the stud that I assume are to act in place of the washer. This doesn't work on the 3 inch version and allows the stud to thread too far in.

What I did was to grind approximately 3 mm off the stud and remove these nubs so I could use a fiber washer for a spacer.

 

Has anyone else run to this problem?