Problem is, pennies make terrible washers. Zinc is way too soft.
Fiat can't even do this right. 

 Euro slightly better in this, except they stopped making 1 and 2 cents, and 5 is rare already.

https://m.primal.net/HmQG.png 

 Better to melt it down and make something 

 Quando a arruela não vale a moeda 🤣
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