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I kinda knew they were crap by the $10 pricetag. Actually cut worse then the 5yo original blades I took off. Iv sharpened auger blades b4 and they seemed VERY SHARP!! They would shave hair but when I installed them they wouldnt even scratch the ice.
ive used card board works fine. about the thickness of 12 pak carton. try 1 piece to start, if it cuts better you might try 2. you want bigger chunks not snow cone ice. when you sharpen your blades, try using a wet stone only on the beveled edge, dont touch the flat side.