Step #2
Now remove the screw and set it i a safe place. After this lift up the peice that the screw was in(it should be black unless you are using a zz, it is clear). Now pick up the small plastic peice with the magnet in it(and the small bar twisted around it) andsit it somewhere safe also. Now, remove your bit wheels, and sit your zip zap wheels, in place(long barlike part of the steering knuckle first) There is a picture at the bottom of this post. After you set that in put the plastic part with the magnet on top of the knuckle and put the piece tat the screw was in earlier back on top. Now push your pcb back down and reapply the clear cover. ANd now guess what....your done! Im sure you can put the rear wheels on. Ok now some it bodies like the auto modellista set dont fit. a little work knife can cleanly and easily solve htis problem. I hope i have enlightened some people in this mod

and i hope that you do it and bring me great results. I appreciate of your reading and i hope i was of assistance.
Thanks,
TemjinNeo78