I've had lots of wheel nut failures on the K' cars for some reason!! Now I replace them every few meetings and even then I have put some thread lock on the stub axles and let it cure.
I think this is true of every car running M4 wheel nuts and explains why the american cars use such a course pitch on the wheel nut threads. Certainly nothing wrong with Kyoshos tolerencing, checked the axles thread detail after my 2nd failure and they are if anything a little large on core diameter.
Have a look on Ebay for M4 flanged nuts, can be had fairly cheaply.
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