Was getting ready to put the boat away for winter and noticed the pin on the coupler was loose. I don't know what is missing but assume some sort of clip? Do both sides of the pin need the clip like what is shown in the first picture? The second picture is the other side and that seems to be missing the clip. The third picture is the pin removed from the coupler just for reference. Am I missing any other parts and is it just the clip I need? Where can I get another clip like that?