I agree. That lower looks like it was screwed into something close. but not exactly same thread.Must be an optical thing, but that lower thread looks 'steep' almost like a 2-start to me! My 'York' tenor has these on it, and I am learning here, having so far just kind-of thought 'no-adjustment-that's-disappointing'.
2 start ? I’m guessing that’s what we here describe as cross threaded. Aka skewed going in.
Don’t worry about the ware. Swedge them if needed.
