Take it apart
Hi Mike -Don's suggestion of taking it to a sail loft is a good one. Is it currently jammed, tight, working at all? Perhaps you could take it apart and check the bearings. What condition is the lower drum? There should be some sort of mfg ID on the lower drum, but if not, a sailmaker might be able to help. Worst case scenario, it might be time for a new furling system.Best,Trevor