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I use double sided carpet tape just to hold it in place. Then mark where the holes in the frame you are going to use and take small ballpeen hammer, lay the ball into where the hole is going to be, then hit the ballpeen with a big hammer and bingo, you have perfectly round hole. This would be for the largest holes for body bolts, use small small ballpeen for the small holes and smack that with your big hammer. Same results.