So you're sarcastic then? Or you don't like those bumps? Cause they're intended and used for gripping.
Oh I see. Sadly the rubber part isn't removable, you could buy an analogue stick and replace it, should be easy. Or maybe this may help: https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F143051289119
Removable like how you can remove the plastic part of an analogue stick from a controller? I assumed you couldn't as I can't find spare parts like that.