In reviewing the instructions, I would think what you have in that cap is a 'push-pull' adjustment. The through bolts have to be loosened slightly in order to tilt the cap by pushing with the small setscrews. It is kind of a balancing act, probably easier to accomplish with 2 or more dial indicators on the piece so you can see the effect of what you are adjusting.
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)