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Are they all like this? Thought I'd have seen this when I assembled this on day one. Front has about the same wobble.
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That cup is off center or out of alignment on every 6s Arrma I own. I used to stress about it, now I just ignore it and move on.
Honestly would say it is the PLASTIC cast over the STEEL inner yoke that has the run out
I have for years now made ( machined ) my own drive yoke sleeves ... no run out
View attachment 352933
She’ll balance out nicely going a few thousand rpm.
Is your cup set screw snug on the input shaft flat?
I made an input shaft jig to put the assembly in the lathe collet and just turn-smooth the plastic for aerodynamics, then balance by drilling blind holes… cuz racecar
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