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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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@RV’s-Balls
My favorite technique is to arc weld an old bottom bracket spindle so its sticking out the side of the stuck cup. Then put a crank arm on the other end and then put that inside some scaffolding tubing or similar . The heat of the welding and the massive leverage satisfyingly undoes the most ancient rusted ,cross-threaded, knackered , cups .
Bring it round for a demo if you want