Bung up the BB and fill the frame with caustic soda solution. (Wear gloves and goggles) It dissolves the aluminium over the course of about a week.
Edit; I missed the mangled seat tube. Might be one for a framebuilder
Yeah, Caustic Soda solution was the next option I was going to try after blowtorch - if only I hadn't made such a mess of it.....
@user112326 started
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Bung up the BB and fill the frame with caustic soda solution. (Wear gloves and goggles) It dissolves the aluminium over the course of about a week.
Edit; I missed the mangled seat tube. Might be one for a framebuilder