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Asked Alexa for shopping, actually would likely work, but I would need to remove the bottom bearings and pedals and seal it up https://www.amazon.com/dp/B07KNR9SVF?niid=nl_cl_lst_a_1_1&ref_=nl_cl_lst_a_1_1&nrid=MPMFPHXPP1RPFG15SGN0 More details Tips for using NaOH on a stuck aluminum seat post: • Mix ~1 cup of NaOH per gallon of water (always add lye to water, never water to lye) • Cap the bottom of the seat tube with a rubber plug and fill with solution, or use a length of PVC pipe as a soaking vessel • Allow 48–72 hours — the aluminum will dissolve while leaving the steel frame intact • Safety: Wear nitrile gloves, eye protection, and work in a ventilated area — NaOH generates heat when mixed and the reaction produces hydrogen gas Given you have the repair and fabrication skills from your work on vehicles and marine equipment, this method should be very manageable.