Help ? What tool to Adjust Fuel ??

Does anyone know what tool is required to adjust the valve inside the mixer unit ??  :dontknow:

a 3mm long series allen key should do it.

Thanks Animal !! will have to get it sorted at the weekend   wont be long now before i go for an MOT and get her back on the road.  :mrgreen:

remember to take the key out after each adjustment as the weight of the allen key does effect the mixture reading.
Oh and deffo take it out before reving the engine 8O