You could post this on www.catalinaowners.com
or you could tell us which model and I could get you a web link for it and perhaps the e-mail of the tech editor of that model.
I did post this over there also, and got some comments also. My boat is a 1971 Catalina 22, hull number 880. It's one of the old "Hall of Fame" boats since it was one of the first 1,000 made. Pretty good shape for it's age, I'm just trying to do some improvements and repairs over this next winter.