Occasionally someone asks about wire sources. Well I found a new one...to me at least....had a Microsoft mouse go bad and there was a built in USB wire so I sacrificed it....turns out under the covering there are 4 sort of small wires covered in red, green, white, and black...these could be used... but covering them is a wrap of multiple fine copper wires ....those are the ones... they are very fine and fine ones like this are harder to find...good e.g. to rib an EHC