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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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@coventry_eagle
Solder works well too, those used to solder circuit boards. Place the allen key in the bolt hole, melt solder with lighter, fill up the spaces between the allen key and bolt with the solder, let it set then remove bolt. Heat up the bolt to release the solder and clean the allen key :)