If anyone has a need to drill holes in SG you will find a wonderful source at this link. They are having a sale plus free shipping until April 30. I ordered bits both for portable drill and Dremmel. At first I got a little concerned because there was never any email order confirmation communication from them but in no time at all the bits appeared in the mail. I'm very very happy with Drillglass.com.
http://www.drillglass.com/drillingglass.html
Source for Drill bits for SG
Want to join? Register here. Already signed up? Click here to login!