I had the same problem. Heres what ya do: first, you need a propane torch or some sort of heating tool that can heat up an allen wrench to melt plastic. You heat up the allen wrench that is the same size as the slit in the rim that the axle pin grabs on. Then you put the allen wrench in the middle of the hole, and make it so it will be as deep as the original slit too. Then you trim around the rim so it won't hit on the a-arm assembly. you might want to buy another pair of rims soon. The rim on my rc car lasted a few more runs untill I went the hobby store. I will take a picture in a couple hours, I need beauty sleep.