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They would appear to be Cusco Zero-2 dampers with 5 settings.
Maybe the adjusting slot is not the setting indicator, maybe it is set to position 3??
Try adjusting it left /right to see what lines up for positions 1 & 5.
Your a legend!, that was exactly the info I was looking for, when the weather's better and I've time I'll try and figure out where the dampers are set, it's a bit too harsh, hopefully wind them down for a smoother ride....
Thanks