you can probably get away with aluminium rivets if you can't find anything else. it is a good conductor. just make sure to take off any anodising in the contact areas with some very fine emery cloth/paper (your wife/girlfriends nail boards are good

)
but there are plenty online suppliers
http://www.hobbymechanics.com.au/products/Copper-Round-Head-Rivets.html
http://www.ausriveting.com.au/catalogue/Catalogues2011_Rivets.pdf
_________________
the world is a book, and those who do not travel read only a page
66 Mini Minor sponsored by
http://www.lifeonthehedge.com.au/ The Dog Harness Specialists
It was a pleasure ausmini. I'll miss all you misfits and reprobates
