@SlimCharles can I ask what your sticking the hacksaw blade too to get it into the seatpost?
MY croix de fer has a well and truly stuck seatpost (previous owner mistreated it) and it's ever so marginally too low.
I had a mini hacksaw (the type where the blade projects beyond the handle) with a long blade. Once I’d made the initial notch with the hacksaw I then reverted to using the blade on its own, using a rag wrapped around the end of it to protect my fingers although this was super slow going. Haven’t had the chance to go back sawing since so its still not quite made my way through. I think I’m going to hit it with some WD40 for a few days once I’ve fully made it through the seatpost. Not sure what the plan is at this point for extraction though. Also, this rockhopper cost me 40 quid so if this goes wrong it’s annoying but not the end of the world. Best of luck!
I recently got a alloy seatpost out of a steel frame using caustic soda. It corrodes the aluminium but not the steel. It does damage the paintwork but if ur careful (keep it on the inside of the frame) there will be no damage.
I'm toying with doing this too. Living in an apartment at present though, and fancy getting my deposit back. New house (so long as the bank gives me money) needs a tonne of work so I can wait til I'm there to try that or the saw method.
Have you tried the threaded-rod-and-washers-DIY-seatpost-puller?
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