Fingers probably does this sort of thing all day long!
Try the local quick fit fast budget tyre - they get this problem all day long so they usually have a set of tools handy. Once I fabricated my own key with a few nails and block of metal and a drill. I cut the nail heads off and hey it worked - a perfect fit.
PS: The new forum needs testing - any volunteers?
http://www.torquecars.com/forums/ (All accounts and posts will be deleted when I move this forum data over but I would be really gratefull if you could report any problems issues or errors!)