For all of you folkes out there that are using #11 Exacto knife blades I have found a knife sharpener that will cut down your purchase of blades dramatically. I bought a little pocket knife sharpener at Gander Mountain recently for $3.99. They are made and sold by Smith's Edge. One side has a tungston steel sharpening feature and the other a ceramic sharpening feature. I am able to completely restore a #11 blade with this tool. I even sharpen my retratable utility knife blades with it. I do not find it necessary to use the ceramic sharpening feature at all. This little tool put a useable edge on a pocket knife that I never could get really sharp before. Give it a shot.
http://smithsedge.com/products/product.asp?id=448cid=4
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Bill