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If all this beating hasn't bent the arbor, I would proceed by removing the retaining screw and grinding the wedge off until it is almost flush with the barrel, then push it through the hole.
Before trying to push it through, you should drill two small holes in the ground off wedge by each side and enlarge the holes to relieve the metal preventing its passing through.
You should only have to drill less than 3/16 of wedge material away.
Access to a 1/8 inch end mill cutter would allow you to remove wedge metal more carefully. This could be done in a drill press.
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