see if you like this idea.. closedup top alerion gap. cant see pin hinges. pin is removed for painting.replaced with one long pin.1/16th..no grove to cut.. cant see them when deflected. 1/64 ply glued to hing slots. then ca, and pined. ply wont splt like balsa grain does..used triangle stock on top of wing so it filled the gap and matched hinge thickness..</p>