Probably too late, but I got the seatpost out of my Freddie Grubb by drilling a hole straight through the post and then putting a long screwdriver through and using it to twist the post.
@mashton started
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Probably too late, but I got the seatpost out of my Freddie Grubb by drilling a hole straight through the post and then putting a long screwdriver through and using it to twist the post.