the knuckle screw falls out of all cars if you don't locktite or use a nut. i chose to use a nut cause its easier to remove if i have to, i won't strip a screw in a rush. the proline mt foams fit the stock wheels/tires perfect, i'm not sure about tires though as hobao uses different wheels, they fit on like buggy wheels. the switch on the 8.5 box is in front on the side right below where the tray screws on, it comes with a cover in the box, once you install the switch you can see where it goes easy. the push comes from the set up, with small adjustments it can go from oversteer to understeer, i just don't want to over do it.