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When I would cut a popper face I put the ball rasp in the drill chuck in my lathe. I then held the plug in my right hand and shaped the popper face. Doing it this way allows you to go any depth you want, any diameter. Even shape the face to an oval plug body and have the same land area all around the cup. Start by hitting the center of the face with a forstner bit. This gives the ball rasp a good bite. Be careful, if you slip your knuckle skin stays on the ball rasp.
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Threaded Mode