Don’t bother with the rivnut tool, you’ll be right out of the frying pan, use your two pack epoxy. I had some square polypropylene rod, slightly oversized, which I chucked in the lathe & bored out to take the rivnut & filed to fit but most folk won’t have that luxury + I’m a dick when it comes to stuff like that; chose the most complicated method.
You can easily glue in the ‘nuts but do make sure they align.
M

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