Maybe try cutting off the post and leave about 3/8" or a bit less sticking out of the seat tube and get the biggest easy out that will fit then tap it in the post and twist counter clockwise. It might work too
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(Life is too short to play crappy guitars) 2006 Raleigh Cadent 3.0, 1977 Schwinn Volare, 2010 Windsor tourist. ( I didn't fall , I attacked the floor)