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I've always understood galling to be caused by friction. It could be you had a flattened thread or two, some debris on the stud or in the lug, and the fact you used the cordless ratchet is a coincidence. It could also be one of those things combined with the speed the ratchet spins the nut on. I always put lugs on by hand.
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"Experience is the hardest kind of teacher. It gives you the test first and the lesson afterward." -Oscar Wilde.
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