Denny,
My my, aren't you a big helper.
Not sure what to call it or where you bought it but it works like a lot like a gutter that has been sawed in half, but it has a chain on one end. Hard to see how that information could be any more factual or complete. I'm always amazed how precise you engineers can be regarding technical information and descriptions.
How could we have gone without it all this time?
Wayne