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@fredtc
there was a suggestion on GCN of pouring boiling water onto the seatpost repeatedly for about an hour, but I guess even if you did loosen it that way, then you might still not be able to get enough purchase on the stump. might be worth trying though before you get the blowtorches out
How To Remove A Seized Seatpost - What To Do If Your Bike's Seatpost Is Stuck - YouTube
also was on a carbon frame, may be different