In the assembly shown below, I need to constrain the black part (Shuttle) shoulder within the slot of the silver part (Back Plate). I applied a slot mate, but as you can see in the second screen shot, Solidworks interprets the black part as though it is a female slot rather than a male shoulder component. Hence, when you rotate the Shuttle, it moves until it is stopped by a theoretical bolt inserted in the two slot shapes would limit further movement.
Can any one advise as to how to constrain these two parts properly? I've tried a width mate, but Solidworks tells me the face at the end of the Shuttle shoulder and slot face are not valid selections. I guess I could cut a flat surface at the very ends of the shoulder and on the insides of the slot ends, but that seems like a less than elegant solution. Part files attached in case anyone wants to try and solve this. Thanks!