Use a forstner bit. $10-$15 use water or alcohol as a coolant. This will make very clean holes. I have used them on PVC caps for telescope parts. Regards, w.. -- Walter Banks Byte Craft Limited http://www.bytecraft.com --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .