Thats odd as there were four spare knuckles that came with the car, all rights!
I don't think the car is fragile Roger, I think its amazingly strong. I was actually playing with the car in the garden and teaching my son how to drive it. Instead of limiting the throttle travel in the transmitter setting, or even swapping out the 11x2 for a stock, I just jammed my thumb between throttle and transmitter body (its a steerwheel) to limit the cars top speed. Alas my hand slipped just as my three year old gave it the full moo and the car went flat out into a brick wall. Given that, I expected the damage to be a whole lot worse.... Still, its his 3rd birthday next month, so maybe I'll start him on a Tamtech instead
