Ninja,
Tell Justin to pick up screw driver tip that has a U cut in it. This will hold the nutserts while he tightens the visor cover. Most hardware stores have these in the hardware isles. Or you can just epoxy or glue them so they do not turn.
He should just tint the clear visor yellow and skip using the other one. New visors are available if the one you have is beyond use.
An interior styrofoam liner can be purchased off ebay or from "Government Sales" private web site,not US gvmt. If you did not save the one that came w/the helmet.
Love it all so far!
Thanks for the tips I have tagged Dustin newmagrathea