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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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Thanks ,I’ve tried everything mechanical including getting a much longer bolt [before cutting] to bash expander down to no avail ,looking up from below I can see the conical expander has been pulled right into the stem ,i’am struggling to find a long [20+cm’s]metal drill bit at a reasonable price ,I’ll try chemicals next,one of my students has been gifted a single speed bike but both post and stem were stuck ,got post free’d and hoped stem would follow ,thanks
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If someone has a yearning for a retro Vitus style bonded alloy build the build /bonding quality on these was great ,a real step up as was the vitus 992