Originally Posted by
no1mad
The point was that I wanted to mount more light(s) back there, but I didn't have a clue as to how. The solution has been pointed out to just use a length of old inner tube to increase the diameter of the rack leg to such an extent that a bracket will clamp securely.
But you have panniers?! Not trying to be a wise guy but your lights simply need to be back behind most everything else.