My 1980 vintage H-16 uses fixed jib cleats riveted to the main beam with traveler blocks. My starboard cleat will no longer close all the way. Something is stopping one of the arms from swinging completely inward. It is lubricated but just won't close all the way. Can these be repaired or do I need to replace or upgrade them (after 25 years!). There is no HObie dealer here and I don't see an exact replacement in Murrays catalog.