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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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@stevo_com
I watched a clip once of a guy using chocolate to polish the concave bottom of a coke (other brands of cola are available) can to make it into a concave mirror for firelighting using sunlight. A bit of Dairy Milk (I don't mind committing to one chocolate brand, Dairy Milk's awesome) may be the answer.