What type of glue did you use? If you used wood glue, it probably won't work. Hopefully you used cyanoacrylate or "super glue" or something really strong like that which will bond to both metal and wood?Thanks for your reply. I didn't use much clue and watched out that there isn't any in the thread itself. Should be fine but gonna let the clue set for a few hours now.
If your repair fails, you don't need to go to a larger insert. Instead, you can drill a bigger hole (for example maybe 0.25" or 0.375" or around 6mm to 8mm) using a Forstner bit (this makes a flat-bottomed hole, so that you won't poke through the back of the instrument), and then glue in a piece of oak dowel that is exactly the same diameter as your new hole. (Make sure the hole is exactly the same size as the dowel diameter, then use a sharp knife or razor blade to score a bunch of lines around the dowel to give the glue somewhere to go.) Then mount the original threaded insert into the oak dowel, and it will be very solid. This is the same technique I use to repair door hinges and baseboard doorstop holes in my house.
Hopefully @Sheldon D. can review and approve or disapprove of this approach.
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