Star, you state manuals are full of mistakes and for reference only, but when ever you try to prove a point you use illustrations which you cut and paste from a manual. So you’re telling us that every manual which states H before L is a mistake, but L before H, plus your illustrations are correct? Can’t have it both ways. Second, Tecumseh might be dead, Briggs on life support, but the theory as to how the five different circuits in a carb work has not changed. It doesn’t take me anywhere close to an hour to adjust 99% of the carbs I work on, both 2 & 4 cycle. Using my ear and a Vibratach I can normally can do a carb in about 20 minutes. In your mind I might be an old fart who shouldn’t be allowed around an engine, but the procedure I taught and posted has served me well for the last 50 years and just because you do it a different ways, doesn’t make yours the absolute truth. Just means there is more than one way to get an old fart fired up.