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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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@moog
My machine is like this ^
The black plastic ring needs what is essentially a massive pin spanner that fits in the lugs. A coffee website in the US got some made out of a big piece of pipe with little pins welded to it.
Older machines have a brass mount that attaches to the base with 3 screws.
Like this