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Help!
I have lost a hex nut in my FX-4000P, it seems to be 3 of them, but now i only have 2
They are use to close the back of the calculator and also to close the battery plate.
Anyone know what i refer to, and know where i can find one? Seems to be made of bronze or copper. Very small.

I found a way to fix this. I remembered i had an old non working FX-850P in my long forgotten box of scrap stuff. And guess what? It use the same type of hex nuts as the fx-4000P!!
So now i'm happy again