[jayco]

I've got a rotary selector in my Lincoln 225 AC that is so stiff to turn that I'm almost afraid of breaking it when selecting amperages.

The welder works fine otherwise, even though it's 30 years old. The rotary shaft is nylon and there are traces of what was once a lubricant.

That's the question, what would be the appropriate lubricant for this application?

James Flannery