Battentensioner for windsurfing sails. The batten tensioner is a small injection molded plastic part with an adjuster nut inside. This makes for easy adjusting the tension in the sail battens.
Important in this product is that it can handle two types of batten pocket designs and their different fittings. It has to be capable of coping the forces that work on it. Although this product sits inside the windsurfing sail and rarely comes out, it has a nice aesthetic design that follows the function of the product.