Homer meant Tracing the Arc of Approach with the Right Forearm, not the Clubhead. Since the Arc of Approach is a Delivery Line that guides the Clubhead, the Clubhead covers the curved Arc of Approach. This contrasts with the True Geometric Plane Line because both the Right Forearm (and the Clubhshaft/Sweetspot) and the Clubhead Trace that Delivery Line.
Tong,
As Annikan posted- the above is unclear - can you clean it up?
Were there problems when he removed it?. I am sure someone must know what was going on then. I have heard lots but only second hand, so am not qualified to comment.