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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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@gbj_tester
Please don't ask bicycle related questions on this DIY and Graphic arts forum :-)
Undo mounting bolt, rotate mech about the centre of curvature of the bracket lug, tighten bolt, notice that it's moved again as you tightened it and the chain still rubs, repeat until head explodes.