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Windgenuity said..JEG said..This what happen to my brass nut in less than 2 months old. I see a good use of brass at other application but not on my foil plate box.

By the looks of your nuts, they weren't washed/cleaned frequently. If you go months without washing you're nuts you are going to have issues.
my nuts is fine

don't judge the nut by the pic, it gets wash regularly.
I now have steel nuts and comfortable leaving them attached to the board for days without issue.
Brass nut is fine on single surf fin box but foil box, not for me, because there's a bit more tension there. I'm not about to risk using brass nuts with my thousand$ foil on a cheap weak brass nuts. This is just my opinion and if somebody uses brass nuts I'm fine with that