It's a what? A parasol? Not really, I was just following the directions. I normally install the lower wings then add struts and top wing, but the directions would have you mount the top wing first, so what the heck, I tried it their way. Since I cut the inner struts perfectly the wing fell right into place. Really! Kind of. . .O.k., there was a little bit of playing with it to get it right, but not too bad.