Not sure what you have there so I have made a drawing to explain how the pivot pin was made for my 25. The idea is to compress a bushing which rides on an axle pin. What you do not want to do is compress the wood against itself or the centre board. So looking at the drawing from left to right, Bolt, washer, axle pin, centreboard trunk, plastic plate, washer, bronze bushing, centreboard and so on. When the bolts (blue) are tightened, this pushes everything, except the pin and the centre board, against the bronze bushing (red). This locks everything and some silicon can be used to seal it. I also drill for a grease fitting in the bolt so I can lubricate it. The centre board rovolves around the bushing, the bronze bushing does not turn, the pin does not turn. The plastic is to take up alignment and the metal washer is to prevent the plastic from wearing. Hope that helps.