If you are gonna drill, go with either a 3/32 or 1/8 bit.
If you are gonna cut slots, use the thinnest cut off tool on a dremel or similar rotary tool.
FYI- Walmart sells the black and decker brand "dremel" for around 30 bucks...
I'd rather have a bottle in front of me, than a frontal lobotomy.
You can't be a real country unless you have a beer and an airline - it helps if you have some kind of a football team, or some nuclear weapons, but at the very least you need a beer.
My Cheap and Easy Stirplate