quite a few solutions on ebay
https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313.TR0.TRC0.H0.X15mm+to+12mm+adapter+axle.TRS0&_nkw=15mm+to+12mm+adapter+axle&_sacat=0
I wanted to get this thing rideable for tomorrow. Clearly bike companies have other ideas. I thought I was so clever getting the rear hub conversion in advance...
@hippy 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.
quite a few solutions on ebay
https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313.TR0.TRC0.H0.X15mm+to+12mm+adapter+axle.TRS0&_nkw=15mm+to+12mm+adapter+axle&_sacat=0