just got myself an orginal and a bullet. I tried switching the axles, however the orginal won’t fit on the bullet.
After much studying, I found out that the axle on the orginal has a bigger metal shaft (the bar that connects the two rims).
What i did was i use a small, very small sandpaper and sand the hole that holds the axle a little bit bigger.
Make sure u don’t sand too much, or it’ll be too loose. Warning, after this mod the orginal axle on the bullet will no longer hold, cuz the hole is a bit bigger.
Now, my oem bullet has all its things swapped, except the gear on the motor. The orginal motor has a small black gear and it won’t work on oems.
So, almost everything is interchangeable between the two.
Hope this is helpful.