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Five bucks? Spend some money, get a good one, and a good honing stone or hard Arkansas stone, some honing oil, and a steel or a strop, and learn how to use them. You'll have razor sharp knives for life.
Lansky sharpening kit, & a good knife. I have some Buck ocean pro`s for many years, fantastic knifes.
A butcher's steel keeps the edge honed. If the edge gets too worn, then a stone or ceramic sharpeners should used. I touch up my knife several times when i clean fish.
+1.... And I would like to add....Fancy sharpeners have their place, in a trash can. Youtube has several thousand how to videos, watch them carefully. You will need a few different stones from coarse to fine grit, a leather strop (any leather belt will do) and some water or oil. When you learn how to do it properly and effectively, you will be the most popular guy around. It is easy to get any quality knife to a shaving edge, you will be picking up "junk" for free or little cost and brining it back to life. The best part, YOU WILL ALWAYS HAVE A RAZOR SHARP KNIFE TO USE!!! IT IS A SKILL WELL WORTH LEARNING! There are no shortcuts though, the old fashioned way is still the best.I should add that many filet knives like the Martiini Rapalas, Mora, and others will have what is called a Scandi grind... this is important. It is very common with knives from Norway, Finland, and Sweden. You may want to google that.
I use one of these http://www.worksharptools.com/sportsmans-knife-and-tool-sharpener/work-sharp-knife-and-tool-sharpener/flypage.pbv.tabs.tpl.html.These things will put an amazing edge on any knife. Well worth the money.
Touch my rapala knife up with knife steel, really works good for me.
I use a GATCO sharpening system. Works just like the Lansky, just a different brand. Makes all knives (even serrated) sharper than new. NBG