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being applied to it. In order for cracks like that to develop the washer would need to flex. If the washer were supported on a flat surface, there wouldn't be any room for it to flex. However, if it were installed onto a previously compromised bolt boss where a smaller washer had already imbedded into the aluminum and the bolt boss wasn't machined flat to repair it, then I could see the dead space below the washer would be enough to allow it to flex and potentially crack.
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