Call Catalina
Jim, it's been awhile since I've talked with the Catalina Customer Service people, but I believe Randy is the one who answers in that department. He's very helpful and knowledgeable. If he doesn't answer on your call, he will call you back. In my case, I needed to know about the shaft nut and the cutlas bearing sizes for a '79 and he was right on target. Tell him "Hi!" for me.
