Sorry, I had to run get a pizza.... the knob to which I am referring is approx 1 1/2 inch to the left of the "B" in Bowden in the pictures, and has the cable running through the center of it and it has 6 points/bumps on it. When I turned that knob, it visibly shortened the cable which runs through the center of it, taking up the slack going to the next piece of the linkage. I once read on another site that if you turned the knob too much, that it would start in first, and never shift into high. Don't know if that is true or not. This is all heresay, except that I felt that it helped my situation. Others may know better than I do. Hope that this may help out a little.