All, I just took a first look at the car. Out of the box, I could tell something was rubbing inside as I manually turned the rear wheels. The stock stop collar is too wide for the corresponding cavity in the body. As I would rather not grind the body, can we allow aftermarket stop collars? It looks like one could also sand the stock stop collar but I am not sure how much material can be removed/if it would work given the thickness of the grub screw.