You can't put bigger balls in the CV joint without having to remachine the inner and outer races. The question is does a bigger opening in the cage i) provide an advantage, ii) even if there is no advantage, can the cage itself be machined?
To me the real issue is that by not having a spec and allowing remanned axles it doesn't matter - it's trying to prove a negative. Can a competitor prove that no remanufacturer modifies the cages?
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