I found a round metal perforated disc about 1 1/2 in diameter that fell out from behind my dash when I was replacing my Headlight switch. I have no idea what it is or where it goes? It appears to be made of copper and
it looks like a rheostat disc of some kind. It has a fibre disc attached to it. Never seen one in my 60+ years of working on cars. (I can't seem to attach a picture)