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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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@user65906
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