[cryptonector]

It's probably defined by the catch points as that's what matters: whether the catch points end up where they belong (good) or not (disaster). The catch points are not "out of round".

[slashdave]

That's worse, considering that the control points are a huge distance away. Just flex alone has to be huge.

[cryptonector]

I should have mentioned that the catch points are on one long bar that goes atop the booster. They are not simply attached to the sides of the booster. Booster shell flexing does not affect the catch points at all.