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Now you'd think you could cut the whole cup with the rasp, and maybe you can, but that doesn't work for me, so I rough out the hole first using fostner bits. In this case a 1 1/8, 1, and 1/2 ". You can see the idea in the first photo. Then I'll use the rasp to do the rest. Note the brass wire brush. That gets used to clean the rasp several times with each cut....otherwise things stop cutting and start burning.
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