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11mm lock nut,undo this,pull the actuator rod of the wastegate and turn it anti clockwise, if you want 1bar turn it so only have half a circle and have to pull it back on the wastegate,dont forget to get your fueling checked on a rolling road
I would'nt fuck about with it yourself mate you might get away with it but if it goes wrong it's rebuild time if you want to run more boost take it to a pro and get it set up properly