skyline, you know i dont hold grudges. it's all good ^___^
murcie, on the rear wheels, they have these little spacer-ish thingies. a lot like the spacer on the non-drive wheel of bit axles.
basically, you gotta chop one of those off the pullback wheel to fit it flush against the gear. use that as a spacer, so dont maul it when you cut it off
you could also use the spacer that comes on the rear wheel of the bit axle as mentioned above.
if you've done wheelmods before, this is a breeze, but if not, take your time and think verrry carefully when doing it. i fixed one up for a friend last night, and it went tons smoother than the car you see here
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*note: the front wheel wells must be shaved out a bit on the inside to let the wider rims turn freely.