I exchanged my handles for two 1 oz Philarmoniker gold coins, they are fairly large size.
For some strange reason the zapping felt stronger than normal, or possibly just more concentrated as I felt a small burning sensation where the coins touched my skin.
Only my 3rd day zapping by the way, may be I should be more careful experimenting with new variants.
not sure I am the first gold zapper, but I guess not the last one.
my zapper was about $100, and my handles are almost $2000