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Post a pic if you can. Whenever I fixed cracks with epoxy, I do what you did, dremel out the crack and especially the ends into good metal to relieve stress. I love JB Weld for somethings but it's got a pretty high durometer and probably fractured from vibration. I like to use Loctite EA E-40HT because it's high temp and oil resistant/impervious (like JB) but most importantly it has a low durometer so is excellent at withstanding vibration. Surgically clean surface interior and exterior too, scuffed with scotchbrite for maximum surface area and therefore adhesion.
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Tru6 Restoration & Design
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