I have a triangular part in the center. On each side of the center triangular part, I have inverted triangles. I have mated the faces with coincident mates, so when I move the center triangle upwards, the two triangles on the sides split apart (like a wedge). What I want is for the two outside triangles to stop moving once they clear the central triangle. Right now they continue to move outward. I also want the central triangle to be able to keep moving upward. I tried placing a limiting range on the outside triangles, but that stops the central triangle from moving. Is there a way to do this?