Nope no teacher.
If we want another down and dirty way. You can use a tailors tape, that's the way I was show back when I first started.
Just mark your track, then measure across the ball to track on the other side, find the halfway point and make a line. Turn the ball a quarter turn and do it again, where the lines crossed was your pap. put a piece of tape on it and check.
(its like measuring to find your tilt, except your measuring on the positive side of the track)