modding a counter attack

Hey, I just want to paint the face caps that cover the axle on my counter attack, and I want to take them off so I can paint them easier. Do they just pop off? or do you have to do something else to get them to come off?

The caps should just pop off using a suction cup, but I’m not exactly sure how those caps are held in.

Because of the weight rings, I don’t think you would be able to get them off.