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For anyone confused, just gonna point out OP asked about rubber o-rings from the hardware store, not metal hardware. O-rings are non-metallic
Ohhhhhhhhhhh
Aw man, it was good info about metals and the likely inclusion of nickel at the hardware store
Yeah but I replied with it because I misunderstood what was being asked. It’s not relevant to OP’s question.
If I had left it, it would just add to the confusion.