Purchase a Havalon Piranta filet knife on ebay and you will never have to worry about sharpening a knife again. The blades are surgically sharp and you just replace them when they get dull. Replacement blades are not expensive. I purchased one this year and it is the best knife I have ever owned. Cleaned several deer, turkeys, and a big hog, and actually enjoyed it. Be very careful though, I cut myself and I bled like a "stuck hog."