Nicklaus included? I think the point is at impact their heads are centered and at impact fix height etc. Pros have a penchant for compensation i.e. raw talent. I know that my noggin will always move a bit...if it moves a lot...well lets just say it ain't pretty! A mechanical ideal is something to shoot for. I am going with Homer on what is ideal.
Thanks OB. What I am feeling is the strange sensation of a right wrist that is no longer cocking. A first in 20 years. I do love the machine! Thanks for the little drill. I do get the difference between visual/geometric flattness.