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Ah the old stuck seatpost conundrum First things first is the frame ali or steel?
Ok so melting it out gradually with caustic soda is a final option First try giving the post a sharp smack down further into the tube with a hammer to break the "seal" then try it in the vice againIf its slipping in the vice drill a hole throught the top of the post big enough for a decent sized alen key or something similar and try in the vice againOther options are:Cutting down the lenght of the post with a hacksaw blade, a ballache! Drilling out with the right sized bit, difficult Heat? not the greatest of ideas usuallyA bigger vice
you best bet is leverage clamp an old stem onto the post... put a piece of pole over the stem's 'stem'... put the frame on the floor...stand on it... push the pipe down ( gently back and forth )The alloy post will either work loose and come out or snap off ... then you need to melt it out