I know it's not quite the same thing, but there's always the option of a white industries eccentric eno hub. Works on ANY riv frame. There was a blug entry or reader article or something, that specifically said that this was the reason Rivendell is unlikey to do any more single speeds (of course, right after that, they came up with the track style dropouts used on the rosco bubbe bikes, so who knows if or when they might change their mind)
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