I have a 1973 Starcraft American with a Waukesha 302. While on the lake today we heard / felt a little thump followed by some jangling noise. After poking around I found this... collar (?) that seemed to have broken loose from the back of the main pulley. I can't see or tell how it was ever attached or what it's purpose is. I'll get some pictures posted tomorrow. But does this ring a bell with anyone with 302 experience?