In this photo, it appears that the spring winding direction allows for the dimple pressed into the nut to catch on the the tip of the spring if a nut was trying to wind off counterclockwise. That said, if the springs were wound in the opposite direction I suppose it would probably still prevent unwind if just trying to climb the coil, instead of contacting the tip. I see the spring cups are keyed to the holes but wonder if the bottoms of the cups are also dimpled.
Richard L.