I'm wondering why those truly in the know don't post. Where are our vendors, those who do repair work in quantity, what do they think, what do they do? I can't believe they check every TA bolt on every car that comes in, that's neither logical nor reasonable. Which bolt is in current favor? That there have been failures is a given but what percentage and under what conditions? Toby feels that those who do not push the cars all that hard will very likely not have bolt failure. Added to that, those who engineered the D were not amateurs, quite the opposite, lots of experience. It's quite likely that every car of every make has had some examples of bolt failure at points of strain, the usual replacement has nearly always been the factory original bolt. While we are thrashing around trying to come up with good answers based upon either limited experience or what we hear from others with limited experience, the guys with the best answers are not saying anything. Here's my read: we support the vendors, they support us. I'm waiting for vendor input on this issue. .