Got one of the new model 31600 AA electric knives for father's day, like the smaller size, fits my hand better. My old one still works fine, has cleaned a lot of crappie and some saltwater fish too and that's a job. Looking for it to give it up anytime now. Just a heads up, may just be mine, but the older blades will not stay locked down in the new model, has to have the extra hole forward of the notch. Anyone else had that problem or it just my knife?