My '76 O'Day 25 is new to me this season, and equipped with a Schaefer roller furling system. Previous smaller boats I've sailed have always had hanked on jibs, so roller furling will be a brand new experience for me. I think I've figured out how it works, but don't yet understand the purpose of two hooks which extend off the top of the spinning swivel that's shackled to the jib halyard. Any advice from folks with experience with older Schaefer furling systems? Any general advice on dealing with roller furling would also be apreciated. Thanks!