Rudder design flaw

I am in the process of having the rudder replaced as the original one bent and sheared at the post. Apparently there is a design flaw that was corrected at some point. The post for the new rudder has about 150% wall thickness as the old one. Our rudders are the same oned used on the C400. A friend of mine with a C42 who recently completed the Pacific Cup race replaced his rudder as a precaution after reading about a number of failures. The old design used a tube with thinner walls and a second tube inserted into that tube. The weld for the second tube happened to be right at the entry point into the lower bearing where all the load is. CY now makes them without the inner tube and just a thicker walled single tube. I am referring to the rudders used with the fin keel

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