I can't seem to adjust the idle screw correctly.! please help me


This is a picture that I got off the forum, which side of the opening are we adjusting.. I seem people have opening that's facing the engine and some people have openning facing the HSN. When I turn the idle screw, I can see the opening facing the HSN gets biggers However, after a few throttle, it goes smaller and smaller likes it's going back to the original position. Once I have enough openning, the throttle is too tight...