Stop in for a cup of coffee

Tooljunkie said

If you wanted to use an insert, put epoxy on it before installing. Shouldnt ever leak.

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Good idea!
The question is whether this particular one will bite at all. The ones I like to use, AVK, would work if they made them in this size.
One nice thing about Timesert's is the countersinking creates a flat sealing surface for the washer.