Hmmm I've not seen that before, guess someone has engineered it for the clocking of the turbo and the oil feed being in the way.
I doubt it is one normal thread and one reverse thread so as you wind it it either extends or shortens the actuator arm. You could shim the actuator? Take it off and slip a washer on each of the protruding studs, looks like you have some threads left on them, how much it will gain you I don't know though.