Decorative doorknob casting (prior student term paper)

Weren't one of you the ones who did doorknobs, how to manufacture doorknobs, a few years ago? One student was interested in decorative doorknobs, and she came in and talked about how you make decorative doorknobs. That was when I was teaching a casting course, and it sort of fit in because the decorative ones are often cast. If you want to sit down and talk about it, I'm happy to discuss it, but you will do the best job on something you're interested in, or something you want to learn about, or something you already know about. I want it to be fairly specific. So talking about decorative doorknobs is fine. It doesn't have to be welding — this is a welding module, but you could be taking one of the other modules. I'm not that picky. We only do this for fun, okay.