WRT the OPs original question, I tap all my nut plates with a regular tap.
For the ones that worry me (ie keep me awake late at night) they either get a dab of Locktite242 OR the nutplate gets slightly re-squeezed to bring back that bite. And a new screw.
In my build, I have a lot of nutplates, over a 1000 easy - folding wings, associated panels and structure that needs to be removable for mx will do that. I'm taking most of these screws in and out 10s of times, some close to a 100times in the build phase alone. To have them bite while I'm being creative is a pita.
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Mani
Busby MustangII (FoldingWing) Pending DAR.
Don't be a hater; I'm a cousin with thin wings! 
N251Y (res)
Last edited by maniago : 12-25-2017 at 07:06 AM.
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