Step 1: Gather materials and disassemble car
Some of the cars have screws and some of them have pins or rivets. The one I chose had the latter, so I just carefully pried the bottom off with a flathead screwdriver.
Step 2: Trim inside car where needed
Step 3: Cut wheels loose and add new front axle
Tip: cut inside a bag and you wont be looking all over the room for the piece that went flying.
Find a piece of wire as close to the axle diameter as possible (slightly larger).
Keep the wire long and heat the end with a lighter or torch.
While the wire is still hot push it through the front end of the case.
Keep it straight. You might need to pull it back out and reheat then finish pushing it through.
Heat the end of the wire and push on the wheels then trim off the excess wire.
Step 4: Bend rear axle and add last 2 wheels
Try to keep everything straight.
Heat the ends of the wires and push on the last two wheels.
Trim off excess wire.
Step 5: Remove fender skirts if needed
This step should be unnecessary for most models.
Cut and file.