The threads in the bakelite dont last very long unfortunately so dont over tighten the screw. You often see the rubber boot on ebay, Roadstar of Dover were selling them for under a couple of quid but often they are near double that. The pin that pushes in, I usually like to solder these onto the end of the wire but they can come out easily, ensure that they are clean and roughend up a little then they should be ok.