[twobjshelbys]

Lead mallet from American Hammer (search for that). Then be sure to pound on each ear of the spinner too, not just on one, in rotation until it releases. It will eventually.

When replacing them clean the spinner/wheel mating surface, and then spread a little anti-seize on the flat surface of the wheel (or spinner) where the two surfaces meet. You don't need much and try not to use too much as when they close up it'll squeeze some out and that stuff is nasty to clean up. This will make it easier to remove next time.