Sorry, Greg, my bad. I understood the ruling to mean that the seat had to be fixed once mounted as was explained to me by a tech inspector. I realize that different tech inspectors have different interpretations of the same rule. I was told by Caroline that the seat mounting failed, not the back, but that could've been my interpretation in the retelling of the story. I was aware of the roll cage failure as a result of, the angle of, and the severity of the roll over. It's not unlike the FA accident at the same track where the roll cage collapsed in a flip. The things are only designed to take so much. That accident also led to changes in roll cage structures for formula cars.