try http://www.concentric.net/~Dhmodels/workshop.html

You will have to click on the H-9 33% Cap to see the wing hold on method,but it works the same for the Edge.I went through the effort on my Edge to mount the wing from the inside and it worked fine,but on my Cap I used a peice of hardwood dowel epoxied into the end of the tube,driled and tapped for the 4-40 screw,and it works fine,and a whole lto eaiser,but to each his own,either works fine.