Employee
Join Date: May 2004
Location: Berkeley, CA, USA, Earth
Posts: 250
Bikes: Bridgestone 450, A Camera, 46x18 Fixed Gear, Homebrew Tandem
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Could it be possible that you have the single speed hub? A fixed gear hub should have two steps of threads, one regular threaded (for the cog) and a smaller one outside of that which is left (reverse) threaded (for the lockring).
Seems like you know a fair amount, but just in case you didn't know about this.