Hey Guest!
In the future, there is a tool for that. Had mine for decades. Looks like a BIG set of end nippers, with a knob on one side for a hammer. You see caps all the time with collapsed sides from screwdrivers and hammers.View attachment 33238
I haven't seen how to remove this cap for the rotors. Just that it needs to be removed for the hub.
Thank you in advance.