Henry, I have a spare bolt/clampy bit sitting around that you could try if the problem persists. It may be that the thread on the bolt isn't gripping enough. I dunno if mine is the same size but it's no hassle to bring it tomorrow.
@MaxC started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Henry, I have a spare bolt/clampy bit sitting around that you could try if the problem persists. It may be that the thread on the bolt isn't gripping enough. I dunno if mine is the same size but it's no hassle to bring it tomorrow.