I found this cool tool at a flea market for $5. It's called "Jab Saw" and was made by Dreier Brothers. This tool holds a hacksaw blade and would be perfect for cutting slots inside a stuck seratpost or stem. Unlike the handles that hold hacksaw blades these days, this tool will go down inside a seatpost/stem and holding straight against flexing and bending. I don't think it's made anymore, but I see they are available on eBay.
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