I use 3 in a square pattern on the three unsecured sides.
BTW, I just put my 1977-S in the open advertising section for sale.
I did several of these on eBay's coin and paper money forum and it was a hit so I'll try it here (don't worry Speedy, I'm not trying to copy you...
http://www.coinfacts.com/ http://www.coinbrowser.com/ http://rg.ancients.info/guide/counterfeits.html...
Just thought the ebayers here might appreciate this. I personally find this very useful. http://www.auctionsniper.com/
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