what needs to be replaced on my 3905?

[blueb8llz]

ok, im not sure what stock part i need to replace on my emaxx 3905. one of my front wheels wobble for than the other 3. the wobble im talking about is...you know the part you tighten with the grey plastic suspension multi-tool, i believe its called the pivot ball caps.
when those ball caps are not tighten the wheels tend to wobble right and are loose fitting. thats the type of wobble im getting now, But even after if i have those pivot balls very tight, the wheels still have wobble.
i know this was caused by too many cartwheels.
anybody know the name or part number i need?