Using the same procedure as in step eight, affix the coupling to the other side of the thruster.
Step eleven:
Holding the motor slightly shaft end up, put a bead of hot glue on the edge of the inside of the cap. We want to prevent water intrusion as well as avoid gumming up the motor with cement. When that first bead is dry continue with another bead. Repeat until sealed.
Step eleven:
Affix a thruster prop the the end of the shaft. (Note: I did not show this step because methods of attaching a prop vary on the prop you buy.)