The bulkhead covers it anyway...this is my first time drilling glass so not bad I guess. When I do the two 1" holes for the overflow box I should get a better one.
I just wanted to make sure I didnt overheat the drill bit (it was submerged the whole time). Took me about 10mins, but I went pretty slow with no pressure applied. I think my drill is 1200rpm, and I ran it at 1/2 to 3/4 of the full speed, so around 800rpm.