you can buy switch cleaner/contact cleaner in a spray can from maplins -this may sort it out, if it's not too bad. squirt the stuff down inside the knobs etc. often works wonders.
@nimhbus started
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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you can buy switch cleaner/contact cleaner in a spray can from maplins -this may sort it out, if it's not too bad. squirt the stuff down inside the knobs etc. often works wonders.