So, I was glancing through the users manual the other day an it seems that you can change the head stock angle on the 748S and 998. But of course, the users manual is incredibly vague. Does this mean that i can change the angle of the forks and therefore the rake/ trail on my bike? I thought only 749R's could do that. If not, what is the purpose of the head stock eccentric? How is it used and how does one measure the adjustments made? Thanks.