I have searched for this and not found anything for it. Now to clairfy this I am not talking about the plug end. At the dist end they have this sleave that slides down the end of the plug wire. My problem is that how do you keep it on the end of the wire. Crimping it just busted it all to pieces.....so right now i am Super gluing it on. So far it is working but i know 30 years ago there was no super glue so how did it hold the wire?