Thank you for the offer but, before you invest the effort, I’ll try one or two approaches that require less metal cutting and accuracy. I’ve experimented with JB cold weld epoxy combined with a small piece of steel mesh and I was unable to strip the thread using a screwdriver. I took delivery today on a box of U-nuts which I’d consider a backup that requires less cutting accuracy. I might even consider a combo of the U-nut plus the JB cold weld.