I'd use a very small amount of Hondabond 4 (P/N 08717-1194) to fill just the void. Hondabond 4 is a semi-drying liquid gasket. This is the same product used to re-seal engine crankcase halves. Just don't apply too much, as an excessive amount can squeeze out into the inside of the case, which could break free and possibly end up in an oil passage and block oil flow. RTV might work, but I think the Hondabond 4 would be a better choice in terms of holding up to constant contact with engine oil.
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