Which nut goes where?
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Why the gap between the bottom nut and the rim? Wouldn't that allow the tube to shift causing stress at the point where the tube mates to the stem? I always turned the bottom nut on finger tight then locked it in place with the top nut.
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The conical washer sits over the inner tube valve stem and should follow the contour of the valve so that the convex side sits against the wheel rim when fitting.
Once fitted to the wheel the two lock nuts sit on the valve cap side of the wheel rim. After fitment and inflation to the correct pressure, the two nuts should be backed up towards the valve cap, and locked against each other.
This is not usually an issue on correctly inflated road going tyres, but should there be any slippage of tyre on the rim, during heavy braking or acceleration for example, the inner tube could be pulled around slightly with the tyre and if the inner tube is bolted to the rim the valve can be ripped out. If the lock nuts are raised towards the valve cap then inner tube has some leeway to move before this happens. Any movement is thus obvious as the valve stem will no longer be straight and pointing at the centre of the hub, but will be pulled round at an angle.