i'm taking the plunge and going to cut my Antec P180 side panel a window. i've planned it out, i've even done some test cutting with a new jigsaw i bought. so my question to all you side panel modders out there: what do you use to round off the corners? i've been playing around with various diameters. the bottoms of aerosol canisters, CDs, i've moved onto pennies, particularly a 5 cents piece i have as souvenir. the diameter of this baby is about 2cm. but while i would love a small tight corner and not a gaping yawn to round off my corners, i wonder what's the tightest i can go. so i ask you: what's the tightest you can go? and what did you use to round it off?