I aligned the flap with the aileron trailing edges and used 1/4 inch bolts as spacers between the flap and aileron. Then I drilled the flap hinge and clecoed to hold it in place. There was some slop in the flap brace and when I riveted the hinge I started from one side and drilled/clecoed. That was a mistake. I should have drilled/clecoed on bothe edges and the center, then work my way bach out to the edges like I did on the left wing. I ended up with a 1/16 inch misalignment on the trailing edges of the aileron and flap. You can't see it in this picture but it's evident when you use a long straight edge on the trailing edges. It will still fly just fine, but it could have been better.