Вот что написано у
Severne
dual clew positions:
allows the rider to fine tune rig to his requirements. the higher eyelet assists the rider in hanging off the rig, which is favoured by freestyle riders and many new school wave riders. the lower eyelet position favours shorter riders and allows you to drive more power through the board. in racing rigs, the dual eyelets facilitate different rider heights as well as allowing more control over the leech tension by changing the clew position
