After speaking with turbo_911 on 6GA, apparently the non-adjustable and the adjustable AMR's seem to be near identical, aside from the adjustment knob. Slava (turbo_911, who purchased non-adjustable ones) confirmed that a 3mm allen key works, and he has "7 or so" distinct clicks of adjustment, just like my adjustable ones. Ppl with non-adjustable AMR coils please confirm and chime in.