I've pulled the McGard key into pieces twice on wheels that never ever had impacts used on them as I do 100% of all my own work. And somewhat undertorquing them, I never use the full amount. It takes a couple years use to fatigue them enough to break though.
Just sayin'.............I was forced to work out a method to get the lugs off without hurting the wheels at all. Takes 8-10 minutes a wheel to do it.
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