They make non-electric knives with an offset handle and they work pretty good. If you need the heat, you can dip it in hot water. I started with an ancient (actually, antique) knife just like that. If it's sharp, it does the trick. When I only have a few frames, I scratch the caps off with a wide fork or a scratcher made to do that. I've heard of people using a serrated bread knife. All should work just fine. When I have a lot of frames, the heated knife goes faster....no question but it's not necessary.