MKIV Unit 2 Jib Reefing and FurlingFree-Rolling Ball Bearings Multiple rows of large-diameter Torlon® ball bearings in high load areas of the halyard swivel and drum minimize friction for smooth furling; Require no lubrication or isolating seals.Strong Foil Joints. Tough triple-interlock foil joints withstand years of torque loading. Connector’s geometric shape interlocks to foil and secures with a syringe-injected adhesive into an engineered channel. Screws provide final lock.Easy to Assemble Foils C-shaped open connectors with low-friction plastic isolators slip onto the headstay wire and into foil for easy installation.Drum Installs Over Existing Turnbuckle Units are adaptable to a variety of rigging options for easy installation. Harken toggle assembly accepts standard turnbuckle using swage, rod, Norseman® or Sta-Lok® terminals. Toggle flips for fork or tang chainplate installation. A single stainless steel clevis pin provides access to the turnbuckle for adjustment.Stainless Steel Feeder allows fast singlehanded hoist and quick sail changes. Removable Split Drum, line guard and spool come off easily for racing.Double Foil Grooves for Racing Aerodynamic aluminum Air Foils® handle extreme reefing loads. Double foil grooves allow fast hoists, douses and sail changes.