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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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@edmundro
Might be of interest.
My dad still has one on his Raleigh Max
http://m.ebay.co.uk/itm/Daves-Chain-Device-/112530704108?hash=item1a335a46ec%3Ag%3ApUcAAOSwcgNZB2HH&_trkparms=pageci%253Ad13d9f95-8b5f-11e7-a4df-74dbd180cf81%257Cparentrq%253A25373cac15e0a7e07254398efffdf5b4%257Ciid%253A10