1500
I've also heard that the 25 uses the same bolts. From CD, the pin is the same 1" diameter. My point in the prior post is that I can't imagine any other cause of the keel disappearing with broken cable unless this pin wore through the keel metal. With, our new to us boat, I inspected the assembly after the first (1 month season) because the cable was shredding near the top. I think that two things were happening there. The boat has been in the water during the seasons and the turning ball developed a flat side,worn through from cable friction. This flat side and lake mud in turn caused the ball to stop turning and to start wearing through the cable where it was usually rubbing. (near the top end). The real cause I believe is that when the boat sits at dock, the wave action (when the keel is up) causes the keel at the back/bottom to wag from left to right just about 1 or 2 inches and this is causing the actual turning ball wear since there is the highest load on this point with the keel up rather than down all the way. The obvious soluting would be to keep the keel down but my dock is relatively shallow. At the end of the season the depth finder was reading 3 ft. Actually one could add another 10 " of soft mud to that but it's still below the down keel depth of 5 ft and there's no telling how shallow the Army Corps would have lowered the lake if they needed to. So my solution is probably goign to be to try to leave the keel at different settings. I think that the lake has been deeper at spring than at fall for example. I am also investigating these "rocker-stoppers" or something in that kind of an idea to prevent less rolling of the boat at the dock. Maybe even start applying the keel lockdown when it's sitting even with the keel up. I think that this rocking also causes some wear on the shrouds but I have not had an issue as yet. Other boats have been demasted in my dockage area from rocking during storms and I tend to favor the 8 stays that we have on our 22s for this reason. Then too, the more L/R wagging the keel does, the more the other pivot parts get wear. These of course include the pin and the keel pin hole in the keel casting. The zig-zag pattern of the Nag's Head boat was probably caused by the keel alternating from either full up or full down at the dock for seasons. So, after the 2nd season, I have inspected the setup and sure enough the turning ball has a few flat sections that I would say even have a "fingerprint" that mimicks the cable twist patterns and the keel pin has a very slight concave wear on the top side of it what the keel's weight rocks on top of. Apparently the keel pin doesn't rotate with the keel or if it does it rests always at the same location. I think that some of the parts like the bolts can suffer from fatigue. I know that certain aircraft parts are prone to such as the wing support structures that are regularly flexing. So I think that you are very much correct that depending on the location, a good average is every 2 years for inspection and automatic replacement of the keel bolts. I think that CD recommends this for a better reason other than just their desire to sell those bolts. And that this IS NOT an issue where we can ever say, "If it ain't broke, don't fix it."