I recently purchased a Legend 37.5 The boat is fitted with a reefing system allowing reefing from the cockpit. This ISOREFF system looks very good on paper but I can't seem to make it work. Must the reefing lines at the boom extremity be attached on both ends or not. If so, how is it that pulling on the reefing line is cockpit I can't seem to reef the sail all the way down?