I think another element to this method is to ensure that the Visor DOESN'T apply any stress to the TeeNut/ or mandibles....
You don't want your Visor, once installed, to be the piece that holds your mandibles in place...causes way too much stress that way.
**That's why it is imperative that you make a Visor template prior to installing the TeeNut's or making holes in your visor.