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Sounds like you all are over-tightening the nuts. Yes, the bolts are specially hardened, but you can still deform the threads with too much wrench. Use locktite, and tighten them well, but not teeth clenching. That's always too much. The bolts are not carrying an axial load - like the head nuts do - so the tightening is just to keep them in place. And that's what the thin metal lock nuts are for (anybody still have these?). So just use good wrenching and some locktite.
Robert
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