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I'd feel a bit safer with threads. I realize that the sharp edges of threads would create stress risers though.
Even being close to the c/l, you still have oil press, heat and some flex cycles in that area. Just my , but I agree with the basic theory on the oiling issue.

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I was thinking threads too, even though the interference fit should work on a plug it's just the thought that would make me

Maybe just a small indentation on the disabled oil hole side to keep the plug from reaching the bearing should it get loose?