u/SamuelElectric

I’m trying to get this right piece the same copper rich color like the left one. I’ve used white vinegar and lemon and salt, but can’t remember how I did it for the left one. I’m just trying random things. Can I get some tips to correct this?

Can someone tell me what this is called and what it’s used for? Thanks!

Can someone please tell me what this might be called. It seems like just a spacer. One was damaged (the slit is normal) and I need a replacement, but a repair kit that has a bunch of stuff I don’t need with it is over $100. Thanks!