I wanted to put a differint end on my cdi so I went down to autozone and picked on a spark plug cable. I cut it in half inside there is insulation and inside of this is a black wire, if I strip away the black caseing of this wire there is some sort of white fiber inside and no metal wire at all. inside the cdi wire there is simply one single copper wire. So what is this white fiber and is it conductive? can I just twist it into the copper wire and have it work?