保持架使 Torlon® 滚柱轴承相互分离并保持平行，从而减少摩擦。固定式 Delrin® 球轴承承受侧向载荷。
Harken Black Magic Air Runners
Runners are used on running backstays of offshore boats to adjust mast bend for different wind conditions. Integrated sideplate bails and recessed cotter key help produce a smooth design that won’t snag lifelines. Foam padded Block Socks easily install over Air Runner blocks to protect your blocks, deck, and crew.
