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Time consuming but draw a outline the size you want then use a smaller drill bit to cut out the circle by making lots and lots of little holes. Then sand smooth. Sounds like a lot of work but it's how I got a perfect 120mm hole in the perspex on my case.
Failing that buy a dremel or a much lesser priced black and decker equivalent. You'll get your moneys worth over the years, I use mine for loads of things.
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DH Reviews: If you like them, Digg them. You know it makes sense.
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