About, "I have a 200 pF 10 KV Doorknob that has one end broken off. It looks like Silver Epoxy was used to fix the terminal to the cap. Correct me if I am wrong. Where can I locate a small amount of this material to repair this cap ?" It might be metal, bonded to the ceramic via some heat process. Try soldering the terminal back on and let us know. 73, Roy, K6XK