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They were cross-threaded. If it were just a case of overtightening and the associated fallout, then one would expect all 5 studs to show similar wear and tear, which hasn't happened here.
This also happens often, as mohit has mentioned, because the guy who is putting the nuts back on will use the gun even to place them on. The nut, pun intended, at Sai Iyengar here in Bangalore did that on my Baleno, and I had to replace a stud as a result. | 
29th October 2009, 00:24
