If they won't do the above, get a 3/32 cog fitted by them. Or money back, goods originally sold not appropriate for your other parts.
@Skülly 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.
If they won't do the above, get a 3/32 cog fitted by them. Or money back, goods originally sold not appropriate for your other parts.