neilpryde uxt extension sdmIntroducing the NeilPryde UXT Extension SDM. Universal pin extension system (UXT) is designed with solid aluminum tubes. Clamshell Adjustment System allows for easy and user friendly operation in all temperatures. Combined with double pulleys for friction free, high tension down hauling. Mounted with Marlow rope. MAST BASE The outer diameter of the upper mast cap is larger than the diameter of the extension tube. This, combined with the stepped collar