Subnostr

Depends on the pan. I do threaded inserts on aluminum pans fairly regularly.

With tap and die?

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An oversized tap to the necessary external thread size of the insert.

Then it's just install until flush and install new stock drain plug.

Might have to try that as a better solution. For now I’m using one of these

Yep. Those type of plugs are generally a quick fix that can be problematic later.