• It may be obvious, and a little drastic, but is there no way you can hacksaw through the seatpost top, leaving a good 'stump' of it standing proud of the frame, then saw dow vertically into it with just a junior hacksaw blade? You could then try crushing the remainig (cut through) 'stump' of seatpost until it mishapes and comes loose? It would take a lot of patience, effort and above all care not to damage the frame/paint etc but i'm pretty sure it could work? Better than heating the tube etc and damaging paint maybe?

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