It gives a more direct, straight-up pull up on the elevon.
The check out Buzz' website, CLICK HERE
Push pins in the trailing edge of the elevons. Note the "U" piece of music wire glued to the elevon adjustment tab.
With rubber band installed and in glide position.
Buzz used Japanese tissue to cover the wing and rudder. It adds a lot of strength and very little weight.
The Skydart being built on the blog is already past this point in the construction. I were to build another I'd probably use this option. Thanks Buzz!