I keep hearing about the AA, but not which model. I know some used to older ones that had a blue or gray handle (can't remember the color or model), but they don't make those anymore. I've heard about the shark blades etc., but still no models. I had a cheapo Rapala that I used for years and cleaned a many a fish, and they still offer that one like the one above that's 12-120 volt. I have another one like it but again, it ain't all that. The two I have ( the Rapala, and the Piranha from Mr. Twister) will clean fish with a struggle. I need a GOOD knife with metal gears that doesn't get hot and stays relatively sharp. Model numbers please. Thx