Did mine last Saturday with zip screws (self drilling, 1/4 inch head, sheet metal 1/2 inches long), work like a charm through the spoiler and the body.
GoDaddy, Did you drop the chin spoiler 10 mm below the opening like the instructions show or did you make the top of the spoiler even with the bottom of the opening, I had my son hold it in both positions and I liked it better when even with the bottom of the opening.