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@flyingpig
Last ditch attempt; try cooling one then heating the other. This works better assuming seat post is alu and frame is steel. Pour a kettle full of boiling water over frame and get someone else to pour cold water over post. This is how industrial bearings are shifted, so might work on the frame, i admit it didnt last time i tried, but that seat post had been in there 20 years sans lube. It can work instantly, but worry not if it doesnt, as steel cools slower than alu so it can still release while cooling. hope it works. I had to cut top of seat post and burr the post out from the inside. Not fun.