** Just one more @CarolKing vape tip that I'm just now discovering is good advice! ** My 3rd?(who knows?)-hand Nano is acting up and requires more opening up. The wires are so old they're brittle! Guess I really need to buy a new Nano, so I can send Ol' Red in for an overhaul but I definitely want him back, dents and all. I always want to have at least one Nano in my arsenal for sure. IME, only soaking & rinsing my screens extends their life, maybe I use a dry toothbrush. Not my toothbrush of course, my wife's. I also find they retain their shape better. However I used to see more fraying and breakage of individual wires when I torched them. As always, others may have different experiences.