Not to argue or disagree with any of the above posts,but IMO I would NOT suggets piercing wood that has been sealed, primed & painted, etc ESP around the grommet holes. This is just an invitaion for water intrusion.You would not put pin holes in the body of the plug after sealing would you ?
Simply epoxy them in place, if they are recessed just a dab of epoxy is all it takes on the flat spot, or under the rolled flange, this is not rocket science. You also dont need a very tight fit cause the epoxy needs a place to go.
just my .02
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