But the topic here is the wire. The cheapest, most horrible wire imaginable was used in these things. It was impossible to strip until I learned this trick. Use the stripper to chop the insulation where you would like it to be stripped to. Don't waste time trying to pull it off. Get some pliers with smooth jaws and crush the insulation past where you "chopped it". Crush it to a flat ribbon -- this decouples the insulation from the wire inside, Then use the stripper to pull it off as you normally would. Discovering this has saved my sanity.
Tom's Home repair pages / tom@mmto.org