Did I miss something in terms of a mechanical self-locking feature, or do the exposed slots on the wing bottom draw a vacuum that helps keep the spoiler closed (via the occluded upper wing slots) along with the airflow over the larger flap surface helping hold the smaller spoiler closed?  Lack of a positive lock and the possibility of the spoiler edge catching airflow and trying to fight the servo was one concern I have.  I can see how the spoilers pictured on the Curare would self-close, but I'm asking about the combined unit as seen on the Big Apple.

TIA

Bob