I have seen UDS's that work fine with several small holes in a flat lid. Some that even just had pieces of steel or magnets to cover the holes. I agree that a larger chimney would work better. But, you have what you have. Go for it and see.
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[COLOR=DarkGreen][COLOR=DarkRed][SIZE=1]me: I don't drink anymore
Yelonutz: me either, but, then again, I don't drink any less
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