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@gbj_tester
If it's really 'a few mm' you can stick a BB spacer or singlespeed conversion kit spacer behind the sprocket. They are available in 1mm increments from 1mm upwards. If you want something with a wide foot, try Trialtech, nicely made sprockets with a 10mm base
http://www.tartybikes.co.uk/screw_on_sprockets/trialtech_sport_screw_on/c73p10409.html