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I have and use the Rapala electric fillet knife.. 8 inch blade...Works really well..
Go to Wally World and get your self a black-n-decker one from the appliance section. They may be 12 to 15 bucks. I've been using the same one since 1991 and have cleaned into the thousand's of crappies, perch, gills, bass, eyes, steelies and who know what else it's seen and it still runs like brand new. The blades that you get on them doesn't have a pointed end so you can't get out the eye cheeks with it but thats the only thing they won't do.