Catyalina vs. JSI
From what I've read in other sources the Catalina spreaders are not a direct replacement for the wooden spreaders unless they've changed the design in the last couple of years. The mounting brackets are different and making the transition is a major project, often requiring removal of the mast. You should call Catalina and get the facts. The JSI spreaders, on the other hand, are supposed to be a direct fit replacement for the existing wooden spreaders, bolting into the same mounting brackets as the existing spreaders. The $310 expense of the JSI spreaders mentioned by the previous post doesn't sound so bad if they are indeed a bolt-on replacement. Have you carefully inspected your old spreaders to see if they need replacement? If they're sound, a good coat of paint may be all they need. Thousands of boats, Catalinas and others, have done fine for years with wooden spreaders.
