0ld school linear arm

DD,

Well, it seems to me that you tried to avoid my previous question. Anyway, I disagree with you and Ralf. I am not going to insist to change your view. 6 mm probably won't change the characteristics of the tonearm. I let the person who wants to adopt my proposal decides what he wants to do.
My statement stands: "Any movement around a circle the center of rotation or pivot point should be the center point of that circle regardless of its diameter." Your examples are not circles.