The new design placed the motors centered directly below the "hinge" of the box flaps. The motors were held in place by duct tape and string, but this can be replaced by a stronger form of joining such as glue or screws.  Since the included servo fin was not long enough to open the box entirely, we used two alligator clip heads to extend the length of the lever arm. The alligator clips sometimes fell out of place so we added duct tape to the connection point as well.