After the amazing success that caustic soda did on my stuck stem I'd recommend blocking off the top of the seat tube/post and turning the frame upside down, then pouring caustic soda solution down the seat-tube somehow. In two days it will have dissolved.
After the amazing success that caustic soda did on my stuck stem I'd recommend blocking off the top of the seat tube/post and turning the frame upside down, then pouring caustic soda solution down the seat-tube somehow. In two days it will have dissolved.