Here are three diagrams from a presentation I made back in March 2006 to the Swedish PGA Coaching and Teaching Summit. As you can see, the Endless Belt Effect (Sketch 2-K #6) relates to the Delivery Path of the Hands (7-23) and its Aiming Point (6-E-2); the Release (7-24); and its Triggering (7-20). Compare the diagrams to Zone Three Photos 9-3-6 (Top) through 9-3-10 (Impact). The diagrams and related study should help answer your questions.
Could the belt be in any other spot? For some reason I had be imagining the bottom part of the belt be passed the ball and have had very little succuess with it.(no radial portion)
I saw this image and felt my belt take place earlier and hit a lot of really nice shots.
For some reason I was missing the radial image prior to this drawing.