Thule awning

[Nomadics]

Does anyone know how the Thule Omnistor awning brackets are secured to the aluminum extrusion of the Carthago A-classes (C-tourer)?

I was told that the brackets are fixed with sikaflex, no fixings/screws. I would have thought if multiple brackets, must be screwed and bonded but if one continuous tail the length off awning, maybe the bracket is merely bonded.

Thanks in advance.