Hi and thanks for the replies, the picture shows my problem except mine isn't split, just has the cracks in it. Your suggestions really were helpful, especially the drilling or using a small hose clamp, I never gave that a thought for containing the boss metal. I even have a corbin clip that is the right size. I knew I could count on this site for useful suggestions. I have one more question, that air vent is in a low stress area so what could cause the metal to crack?
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