So, I first tighten no. 1 and 2 - no problems. Then I tighten no. 3 - and the throttle valve won't go up and down smoothly anymore (or not at all) How should I adjust the screws? Also, I believe no. 3 should be more to the right (at the center), but I cannot get the rotating arm (in which screws 1 and 2 are screwed in to) further into the carb body...?