Originally Posted by mbevins
I would have thought the eye on top was attached to a rod that connected to another eye on the bottom that the chain connected to.
At least that's the way the one I bought for the house was made.
Moorings vary greatly in design and configuration; our having used many on both coasts, I can say FF's statements indicate his experience with moorings is extremely limited.
The ones I am most suspicious of are unknown moorings with an eyed rope pennant intended to be put right on the cleat. I gained this suspicion when such a pennant broke in my hand at Vero Beach; Charles Atlas I'm not. We ended up using our own lines. The harbormaster freaked a bit when I handed him the eye when we checked in.
It is an extremely good idea to consult with the owner/harbormaster of the planned for mooring in advance to understand exactly what you will be confronting.