Haugy: Please excuse me for my lack of proper terminology on this. I have the hinge and the glass for the middle. What I don't have is the part that attaches to the center glass that stops it from falling into the passenger. Its the part with the twist turns that locks it in place. Regarding Surfing with the Mariah, Jetlink and I went out with mine. I second Haugy's comment. Surfing is not an activity for this boat.