Here's the easiest way I've found with my 10.5 arm. Be sure the table is level. Disconnect the Lemo connector. Set the vertical tracking force you want (approximately, you can fine tune this later). Roll up a little ball of plumber's putty (Mortite) or Blu-Tak or equivalent) and stick it on the end of the armtube behind the counterweight. You want just enough of the stuff on there so that the arm floats.
Then experiment with positioning the Lemo connector attachment and reattach it when you have found the point where the arm moves s-l-o-w-l-y backward (toward the arm rest). Remove the ball of Mortite or Blu-Tack and continue with the balancing/adjustment/alignment process. That's all there is to it. Works for me, anyway. I've never had a hint of inner grove distortion or tracking problems using this approach. Dave
Then experiment with positioning the Lemo connector attachment and reattach it when you have found the point where the arm moves s-l-o-w-l-y backward (toward the arm rest). Remove the ball of Mortite or Blu-Tack and continue with the balancing/adjustment/alignment process. That's all there is to it. Works for me, anyway. I've never had a hint of inner grove distortion or tracking problems using this approach. Dave