My wife just removed the wiring from an old electric blanket before passing it on to a local charity. Since the controller didn't work, there was no need for the wiring. Being the curious sort, I took a piece of the heating wire and stripped it to the copper element and lo, there was a very nice coil of fine copper wire around a flexible center. It's just about right for
1/48. It could be a bit tighter coil but still it's not bad and I've got about 40 feet of it!BTW, that flexible center of the coil is flameable so if you want to remove it, just pass it through a flame.
MB