You may notice that modern pennies have galvanic corrosion issues when they get bunged up a bit.
My use for them---putting a bit of zinc back into the melt when I'm casting brass
Or you can take a propane torch and melt the zinc inside the copper skin and make old Abe look a bit funnier.
I punch my holes rather than drill them for washers, easier. And for a strong washer a nickel is cheaper than driving into town to buy one...
CAUTION when the zinc is molten obey all molten metal rules you don't want molten zinc splashed on you---been there done that have the scar, (a bit of a zamac fitting hiding in a coil spring I was working on)
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Thomas
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