This is a post-script to our sesh on Tuesday, 8/13/13. The pin in my UJ snapped. I was not far from shore and I had a replacement but this could have been more unpleasant. I took the photos below and informed Chinook. Apparently there is a problem with the casting of the metal alloy which Chinook was aware of. Per Chinook, they will be recalling the part:
We are in the process of recalling these parts, it has become apparent that there are holes (as seen in your picture) is the issue. Were working hard on a redesign on this product.
I am told by Chinook that the europin tendon UJ (as opposed to the rubber one pictured here) is not affected by the defect.