Many thanks for all the reply’s from the community ,sorry if I’ve not responded personally to them all ,caustic soda method it is then ,I’ll do an update when done ,I fully understand the process now ,never realised quite how much material is physically removed , and also health dangers ,I didn’t go the chemical route because it was hard to believe anything would be better than than trying to shift the expander than bashing a steel bolt screwed in with a mini sledgehammer once the fork was free of the frame but just ended up with a bent bolt and dropouts stuck into a big block of wood
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