Looks like when you unscrewed it, the expander unscrewed rather than the cap. So half of your expander is probably somewhere at the bottom of your fork steerer.
Yep, that's what I realized right after posting. Now I need to figure out how to get out the locking ring without damaging the steerer... ugggh
@BunkMoreland 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.
Looks like when you unscrewed it, the expander unscrewed rather than the cap. So half of your expander is probably somewhere at the bottom of your fork steerer.