An improved version of the foldable butterfly knife by Boamartin: http://www.thingiverse.com/thing:666519. Since Boamartin's was all wiggly when you had it out I fixed it by adding the missing tang pin. I used 4 m3 bolts longer than 20 mm and 4 m3 locking nuts. I also used 2 regular m3 nuts between the two "handles" of each handle, but that isn't needed.