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It's a pain to get it off, but it just takes force. Try prying it up evenly with two flat bladed screwdrivers. Just be careful not to press on parts of the distributor that bend.
If you do, you'll need to bend it all back in place. It's not hard.
I bent the plate once and didn't realize it and my timing would "stick" once it advanced. Easy fix, but it left me scratching my head.
Just be sure everything moves smoothly and the stator doesn't hit the magnet as it spins when you get it all back together and it's good to go.