I put my old rusty and grimy hardware in a small rock tumbler with mineral spirits. Gets them basically all cleaned up. They do need a coat of some sort of oil after, I use Corrosion X.
Glad you didn’t ditch those, you’ll find a use for 90+% of...
I threw all the hardware in my brass tumbler with Nutshell media for a day. I like the way they came out. Now to work the media out of all the threads.
Could anyone tell me if this is the part I need to replace the rusty section that is covered up by the SS metal below?
I believe this picture is one of a newer model year but I found this for the '71 on Marks website.