You can use one of them big circular drill bits, the ones for cutting circles, or if you can't get one of them you can always use a dremel but this could be tricky. I did mine with a dremel and lets just say the holes could of been better.
for doing this I wouldnt recomend using a dremel especially if you havent much experience using one. You can get drill bits which drill a circle and cut out the peice you want.
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