Okay Bob, I took a closer look at the last video and could not see any pivot points. The first class in mechanical engineering that talked about steel flexing and bending gave me a nightmare. 'Endo' is not a precise engineering term but most of us have experienced it! Some texts define the center of gravity or center of mass as the summation of the centers of mass of each component. Fine if you have a high end CAD system. Polar moment of inertia is calculated in each plane about the center of mass. Front suspensions now tend to let the wheel move up and back as the wheel hits a bump. More later
