Does anyone know how the wedge shaped awning brackets are fixed to an Auto-sleeper monocoque shell? My 2001 Clubman only has 2 brackets. I have removed the old rattly awning and I want to fit a middle bracket for a new awning (assuming Auto-sleepers can provide the one I requested). They are solidly attached even with the bolts removed so I guess they must be glued on with something pretty special?