You shoul be able to drill the head of the bolt off clamp the whole lot to a bit of wood and drill carefull as you don't want to drill the chainring.
Do you have the tools to do the job?
@deleted 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.
You shoul be able to drill the head of the bolt off clamp the whole lot to a bit of wood and drill carefull as you don't want to drill the chainring.
Do you have the tools to do the job?