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A self tapper will just vibrate and walk out. Buy a nut cert kit. Drill the correct size hole for the cert, you will install a threaded insert with the tool, and can install a bolt to do the repair CORRECTLY !!!!
You can do that or get a 3/8 bolt and nut. Go from the inside out and make your own stud. Or move the grounds completely to another spot. I really like the nut cert idea