My daughter has been digging her new Radio Flyer model S, but as is typical for these types of toys, the plastic wheels have poor traction and the throttle is really just an on-off switch. There are many people that modify "power wheels" toy cars with rubber tires and variable throttles. I'm ready to try. Anyone want to help? I'm in Maryland, but think we can do this online. I have access to a small machine shop and a 3D printer.