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I went to a nearby party catering service and got an aluminum cover they use on their disposable food delivery containers. It's a lot thicker than household foil which is a nuisance to fool with as spacer material. I cut one piece to fit under the top burr, reinstalled the 3 screws and assembled the Supreme Grinder. I have a grind that suits me, and there is still plenty of adjustment to create talcum powder fine coffee if I decide that's the most important thing in my life.