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My amateur observation is that 3170 ft.lbs of torque (Damn!) wasn't quite enough to back off the center nut, but enough to destroy the drive splines. Thus, either the nut material didn't meet spec or machined incorrectly for the operating conditions and thus failed during the attempted loosening and/or seized on the spindle threads.
Does Paoli PitStop also recommend a dab of anti-seize on the threads during each 2 second pit stop. :-) Maybe that was missing on Botta's ill-fated stop. I guess Toto missed that thread here on PParts.
S
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