Having a hole in the center crossed my mind, but never dealt with one
really. Being an avid DIY'er, I'm always glad to hear of alternatives. I would imagine the edge is already rolled? I'll definitely make a trip to Lowes. If not rolled, I may spring for Wray's gizmo. I like that margin of safety factor. I'd love to see a pic of your disc if you get a chance. I can always use some inspiration.