This turnbuckle was under the bowsprit on the dolphin striker and looked good from the top. I never got down on my hands and knees to look up at it from the dock. What a surprise to see the surface rust and the rusting in the threads. There was a small crack visible on the out side but when I pulled it apart to replace it with a new one you could see the crack was huge on the inside. It was just a matter of time before it let go. I check all of this stuff on the rig but apparently hardly gave the dolphin strike the time of day. It's good to be lucky.