Chinook In Flight Adjustable Harness Lines Duotone Mast The third roller is the

The third roller is the key to be able to use all 4 rollers on the sails downhaul block

and allows the sail to auto-correct during wave-riding by giving the draft just enough movement to ensure constant power delivery

Especially if the base sees significant heat

Euro-pin base

Furthermore

Chinook In Flight Adjustable Harness Lines Duotone Mast The third roller is theThe most adjustable harness lines made! Great for dialing in your harness progression. Buckle on one side for micro or macro adjustments on the water. Rope adjustment for on land micro or macro adjustments. The stock length is quite long and great for learning, or those who simply prefer longer lines. As you progress you may feel the need to dramatically shorten your harness lines, and you can easily to that with these lines. Simply cut the plastic