Hi folks, couldn't find the answer to this on the forum, please forgive me if it has been addressed elsewhere. Tore down an older Dell laptop, and there is a large cast metal looking gray piece of metal, thin and very light, looks sort of like cast aluminum, basically . But there is a symbol inside that consists of the letters "Mg" surrounded by the universal recycling arrows. I know Mg is the chemical symbol for magnesium, but would that be used in