I just had yet another project fail because of a bad connection to a toroid - where the insulation didn't burn off properly. I've had it. I bought one of those motorized strippers for enameled wire. It just came in. It's a Chinese copy of an expensive German tool. Works great for anything thicker than say 26AWG. With really thin wire, you have to be careful, because it can just chop the wire off. Which could be a disaster if you have the exact length of wire you need - coming out of a laboriously wound toroid.
For really thin wires, Knipex makes a manual pinching stripper that looks pretty good. I was on the fence... might still get one of those.
