I bought a phoresor II auto PM 800 from ebay and am having trouble with the electrodes. The machine came with built in alligator clip style electrodes that do not appear to be able to be changed. I tried clipping them to the amrex sponge electrodes but they wouldn't stay. I also tried clipping them directly plain sponges but that wouldn't work either. Does anyone have any suggestions for me? Sorry if I am missing something obvious.