Thanks for the information - useful to know.
The trackingpad wouldn't be magnesium, but the palm rest - surrounding the trackerpad, and keyboard was, I thought, magnesium. The paint wore off where my wrists would rub, and started giving me elctric shocks. It was cold to the touch, like metal, and the wear and shocks suggested that it would have also been magnesium.
I'll keep investigating to look at the current and discontinued parts - to find out if I'm mad of there's a minor conspiracy!
Thanks again for the research,
Message was edited by: Blueear