Pro tip: you can turn the case around if you want the crown on the other side.
Just found out its for a depth gauge fitted to more expensive models.
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@billygoat28 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.
Pro tip: you can turn the case around if you want the crown on the other side.