Arthur, I believe it was the 400E that had the problem
Nah, that was the WECO 400H, Issue 1. Those things were completely unpredictable. I don't see any of them in the OP's pictures though.
400E was of ITT manufacture and they were bullet proof. Bell even started using them in Washington, DC instead of WE400H ones due to the huge amount of federal government 1A2 at the time. They got tired of chasing their tails.
