I have a 1998 Catalina 36. The last two sails, I've noticed a clunking noise coming from the rudder post. It is not a rythmic noise - only about once every 30 or 60 seconds or so. It only happens when I'm close hauled on a port tack (and only on the port tack) and when the boat is heeled over a fair bit. It might coincide with when the boat hits a swell, but I'm not sure. I looked up under the stern port lazarette while sailing and saw that the quadrant was moving up and down just a little bit - maybe 1/4 of an inch. I had a diver check under the water and he said that he didn't see any problem with the rudder, nor is the rudder loose on the post nor did he see any play in the post itself. Today I went up in the aft cabin and looked back up under there. I found that the cable was quite loose. I am unable to tighten it because the nuts seem frozen, so I sprayed some PB blaster and will return in a day or two. Of greater concern is what I saw around the post. Take a look at the pictures. It looks to me like either the rudder post has dropped down or that a section of fiber glass encasing the post has pulled away and come down on the post. What do you think?