Stylus overhang, along with headshell offset angle, was posited (by Baewald and Lofgren back in the early 40s, probably) in order to make it possible for there to be two null points on the playing surface of an LP. "No overhang, no skating" is flat wrong. An underhung tonearm with zero headshell offset does generate skating force everywhere on the surface of an LP, except at the single null point. Why do you insist upon your too simple explanations of nearly everything?
You were correct to fault me for my sentence: "Yes, if you can draw a straight line from stylus tip, through the cantilever, that intersects the pivot point, then you have zero skating force." Because I neglected to say that at the condition described the cantilever must be tangent to the groove. THEN you have zero skating force. That's a description of an underhung tonearm with zero headshell offset angle at its single null point on an LP. MF is not at all my guru when it comes to the physics of playing an LP. He is often parroting something he was told and is sometimes wrong. In this case, he was being too simple, like you.
You were correct to fault me for my sentence: "Yes, if you can draw a straight line from stylus tip, through the cantilever, that intersects the pivot point, then you have zero skating force." Because I neglected to say that at the condition described the cantilever must be tangent to the groove. THEN you have zero skating force. That's a description of an underhung tonearm with zero headshell offset angle at its single null point on an LP. MF is not at all my guru when it comes to the physics of playing an LP. He is often parroting something he was told and is sometimes wrong. In this case, he was being too simple, like you.