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Old 11-25-2023, 10:39 AM   #14
Bill
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I can't speak to the moldable plastic, but as noted in several posts above, your first step ought to be to drill a small hole through the rock guard right at the end of the crack. This will stop the crack from propagating further. The hole can be any convenient size from, say 1/8 inch to 1/16th inch.

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