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Jakub96
nick_h.
Penetrating oil might work but there are several different types, some of which are said to damage carbon fibre. Carbo Move from Effeto Mariposa is supposed to be carbon-safe. https://road.cc/content/review/59182-effetto-carbo-move.
I've been reading about the seatpost man, looking for clues to his secret methods. No luck though. He charges £90 plus shipping https://bikebiz.com/the-seatpost-man-how-john-lee-has-helped-save-thousands-of-frames/
Lots of methods mentioned in this thread at retrobike https://www.retrobike.co.uk/threads/stuck-seatpost.413576/page-2