Just my 2 cents but I would drill it a little deeper and tap it. Use a bottoming tap, then I would put a stud in with some JB weld, let it set. Then I would put a new gasket and a little silicone on both sides of the gasket and put the cover back on with a nut on the stud. That area is not a high stress area.
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2264 with 54 GT deck
1641 AKA Black Jack with a 402-E Haban Sickle bar mower
JD317 dump truck
BX2670 with FEL
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