the rotor is not sliding "back and forth" , it only makes a clean circular
motion around its own center. The weight only is significant for the
centrifugal force on the e-shaft lobe.

Richard;

Unless I'm mistaken, or misunderstand what you're saying; the rotor does not
rotate around its own center.  And the CM of the rotor does not rotate
around the center of the e-shaft, but rather follows the center of the
e-shaft lobe.  Watch the animation on Tracy's web site.

Al