Sorry, but we did not do an autopsy on it.
Rick's memory about it is very vague -- it was 20 years ago. He says part of it also had to do with the handle crossbar in the middle of the ring bending, which allowed the ring to deform even more, prior to the failure.

I did not know there was a swage involved. If so, I already knew that I don't trust swages for other reasons, and if that happened to be at the point where the trapeze hook attaches, I would trust it even less.

But, then, I don't trust any of the many components of a trapeze system between the mast and me.