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If the dent forms a "V" pointing in , then when the die pushes in the oversized mouth , it will pinch the "V" closed , destroying the case . As long as you use a rounded rod ( punch , screwdriver , etc . ) braced against the far inside of the case to pry the "V" out , the die will not pinch it closed and it and the expander ball will smooth it out.
Chris
Chris
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