In my quest to find the perfect medalion to put on the back of my sissybar I have found a belt buckle that I would like to use. The obvious problem is the sissybar is flat and the belt buckle is concave. Of course I intend to grind off the belt attachment points on the buckle. My problem is how to fill the gap in the middle between the buckle and sissybar. Does anyone know of a product such as an adhesive putty that can be used for this? Any ideas would be greatly appreciated!