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@Dammit
When you buy a track hub it will be described as fixed/fixed, fixed/free or single fixed.
Fixed/fixed means that you can run a fixed sprocket on either side, fixed/free means a fixed sprocket on one side and a freewheel on the other, and single fixed means one fixed sprocket.
As overdrive mentions you would need a chainwhip to do the sprocket up nice and tight, and a lockring tool to tighten the lockring down to keep the sprocket on.
You cannot run two sprockets side by side on the same side of the hub.