at the spider end of the rod is a flat hollow rivet (you see just the flat end. Next is a insulator (about 3/16" thick is showing) and then the metal rod. The body of the rivet fits up into the hollow insulator and the insulator fits inside the metal rod. The electrical wire slides through the hollow rod, insulator and rivet and is then soldered to the end of the rivet. Brattons sells a rebuilding kit for the A #5780, I use it on the 35, it has the insulator, wire and rivet.