Shawn I new you were up to something - remember a while back I talked about drilling my tank with everything in the tank with the water drained below where the holes would be. I was going to make a box to hold the diamond bit - the shaft would have to go through the box, I was thinking if you could get a rubber bushing for the shaft to go through and seal even while it was turning (or something else to seal it) - now you are going to use a hole saw for acrylic with a center drill bit, usually 1/4". So all you have to do is make an open ended box that you could clamp to the underside of your eurobracing, have it filled with water before you clamp it, then drill away with the water cooling the hole saw. ANother thing you could try is drilling a 3/8" hole off center in the eurobracing where the final hole would be, which could be used to fill the box for cooling as you are drilling away. Just a thought I think it would work. A while back I also told you of one of our model makers using bees wax on his hole saw when drilling acrylic, the holes were as smooth as glass. Just a few ideas buddy, if I had my work computer here I would draw it up - what size hole saw were you thinking, I will draw something up for you tomorrow.