I had the misfortune of having my lower caliper bolt strip. I was using a torque wrench and I wasn't even near the torquing point when it failed. I think its because I change my pads too often (14 times over the last 7 track events). I've contacted a local shop that I use and they say it happens quite often. As my car is still under the CPO warranty, I was wondering if anyone had any luck convincing Porsche that this was a design flaw? I realize this is a shot in the dark but I figure I have nothing to lose. Thanks in advance.