Help with constraining this ball-joint model for a simulation study

Hi guys. For some reason I cannot seem to correctly constrain this little ball-joint/clip part. I have attached a picture and the model if anyone wishes to have a go at it (I need the help!). The goal is to determine what force is required to push the ball part into the socket. The force is applied to the top face of the ball part.

SolidworksSimulation