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@Sainsburys_Ed
right so im going to do this this weekend.
I want to do as little damage to the paint as possible, as i dont want to have to pay for a new paint job.
so i will remove the Cranks and BB and pour in the solution of caustic soda, but i've sawed off most fo the seatpost trying a differnet method, so i will need some way of plugging the seatpost, what do people suggest i use?
I'm thinking a plastic bag rammed into the remainder of the seatpost , and the tape up the top of the seat tube with electrical tape.
i assume the caustic soda solution wont melt plastic, it will probably leave some of the seatpost alive but will be so little its possible to get out with a bit of brute force...