Here are some pictures from others who have built the ball turning toolpost.
Paul Belt
(Kansas Assoc. of Model Engineers)
I made an addition to the main turret. I marked the center of the turret
and then marked off an inch each way.
I marked the cutter stand to the cutting point. It gives a way to center
on the turning stock and also
a way to set the cutter for the basic dimension of the ball that you
want to turn.
Thanks,
Paul