Hi. Lord Canterbury did a video ? and pics about twisting two wires together and then covering with heat shrink. Looked really easy to do. Hopefully someone else can find it and embed here as computer skills still lacking on my end.
Make sure to put some protective tape around the switch first so that you don't scuff up the hilt when popping/prying the plastic ring off. Be gentle and ease it off if not replacing as the plastic can chip.