From your description, sounds like you have one of those pedestals that taper at the ends?
I had one of those on one of my boats, and it was pretty difficult to take off. I kept a strap-wrench on board to remove the pedestal, as sometmies just twisting it a bit helps.
Of course, if you have a latch mechanism, all you will do with a stap-wrench is probably break something.
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