Stripping with soldering iron
I laid the wire on a block of wood and pressed down on it with a soldering iron, then pulled the wire. That Teflon insulation does not melt like other types of insulation. But the Teflon did soften and stretch thin. After 3 or 4 tries on each wire, the Teflon became thin enough so that I was able to pull it off from the wire without breaking any of the strands. I do have a wire stripper with an adjustable orifice, but it usually ends up breaking a a few strands.
Joe