Ok. Back to model for rolling bodies.
This model is not equivalent to experiment on my site, because rolling bodies contact to surface all the time and both have a rotation. The rolling body with higher moment of inertial will have bigger reaction force to the surface. Which should be compensated by spring through surface. However the surface has it's own mass and will keep reaction forces for rolling bodies difference. Unfortunately I have to disregard my model from my site. However, I'm still working for exact model for my experiment and will publish it in a future.