^^Is the whole boss loose or might it be the first bit of the bolt that's stripped? If the former, could you inject some epoxy to at least temporarily get it to stick so you can get the bolt out and then replace the boss?
@russmeyer 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.
^^Is the whole boss loose or might it be the first bit of the bolt that's stripped? If the former, could you inject some epoxy to at least temporarily get it to stick so you can get the bolt out and then replace the boss?