Plastic Shear Pin
Ray: I don't think much of the locking mechanism that is suppose to hold the rudder down. I know there are some people who do, but from my experience with my particular rudder, it never worked well. (I think that on later years, Catalina may have added a ball and spring method of keeping the rudder down, but mine doesn't have that). Anyway, I use a plastic 1/8 inch diameter pin that goes through both aluminum plates and also through the rudder. If the rudder ever hits the bottom, it shears, or at least bends the heck out of the plastic pin. You don't want to use anything too much stronger than plastic or you could damage something. Do you think that your rudder is loose between the aluminum plates? If you do, you should take it off the boat, then take the locking handle off, and try to push the screw out. I think that you may find that it is corroded in place. This could be the cause of your problem. Again, there are very dissimilar metals coming together here. I again made plastic bushings for the big dome shaped washers, so that they didn't corrode onto the bolt. By the way, that bolt can break, I think that someone wrote about that recently. I also had the bolt break a few years ago, (probably from trying to tighten it tight enough to keep the rudder tight, before I began using the shear pin method to keep it down). I only lost the locking handle and not the rudder. It could be very bad if you lost a rudder, so I recommend replacing the bolt, and when you do, use a high strength stainless steel bolt. When you do get the old bolt out of your rudder, make sure that it moves freely relative to the aluminum dome shaped washers, when you put the pieces of the rudder back together. I may have even put pieces of plastic shim between the aluminum plates and my rudder. I'm not sure, my boat is 100 miles away, and none of my rudder photos show this. I know that I have pieces of plastic shim between the domed aluminum washers and the side plates. I want all of these pieces to be able to move, and not get corroded together. Anyhow, as I said before, I can see how this can drive you crazy. You can figure it out if you just wiggle one thing at a time, and then take it apart and fix anything that is stuck by removing the corrosion, or by putting plastic shims in to take out the slop. If you do take it apart, just do it off the boat, so that you don't loose any pieces. There's enough fun stuff to spend your money on, not on a new rudder. Don't hesitate to reply questioning anything that I mentioned above. I must have worked on my rudder plenty in the past, since I had so much to write about it. Once you get it right, you won't have any problems for years, except for possibly adding new pintles every 5 years. Aldo