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'I'm now of the opinion that vibration is the culprit since others have had exactly the same problem. '
I agree. The part failed from a crack. The crack was probably caused by vibration. The exposed unprotected steel then rusted.
I think this is the sequence of events, and that rust is a consequence and not the cause.
With that said, it's not a mark of quality per se, but not a reason to suspect the other welds on the frame.
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Happy to serve.
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