X2 for Rick76's suggestion tap it so that it rolls out. Alternate sides to work it loose. Could also try grabbing it with locking pliers and rocking it loose. Stuff any openings in the head with clean rags first. Don't try punching it through with a hammer and screwdriver, it could break something. Good luck!!!

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer