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@Simon
I don't have a fixed sprocket on there at the moment unfortunately, so I can't check using a chainline measurement.
Comparing with diagrams on the Surly website I can see what they've done. On each side there's a spacer between the cone and the locknut: 2mm on the fixed side and 4mm on the freewheel side. They've simply removed the 4mm one. I'm sure that can't be right...