severne sails triple hd rdm extensionIntroducing the Severne Sails TRIPLE HD RDM Extension. 3 PULLEY RDM EXTENSION As more and more people are using freeride and slalom sails on RDM masts, a 3 pulley RDM extension quickly became a necessity. The design focuses on reducing friction when lowering the sail and making rigging easier. Careful alignment of the line and pulleys enables noticeable improvements. Perfectly matched to any sail with a 4 pulley bow block, the Triple Xtension also