Drill Press Centering Aid

After making and using the center aid tool by Connorus (http://www.thingiverse.com/thing:725344) I found my drill press wasn't drilling in the exact center of my parts. I needed the holes to be precise so I made a version for my drill press. It uses 1/4 inch bolts to hold the arms and two 5/8 bolts to mount it to my drill press. The mounting holes are 9 inches apart on center or you can use whatever clamps you have. If this is different from your table I included the Sketchup file so you can mod