For everyone having problems with the 210 ball cups, you may want to try my solution. I have done this on all 3 of my Durango cars. The JC rear ball cup are a perfect replacement for the bend ones from TD. For this set up, I have use Losi ball cups with HB/HPI ball studs (From the D4, ask for the long one). I have never pop those Losi white ball cups, hope this can help.