First, the location of the holes for the threaded rod used for mounting the light fixture to a wall are in a terrible location.  You have to contort your hand to place the mounting caps used to secure the fixture to the threaded rod.  You end up dropping the mounting caps multiple times before getting the threads engaged. Second, the mounting caps have a slot for a screw driver to tighten it, but the location of the holes permit the screw driver to engage the slot at a 30 degree angle which does not allow use of the slot for more than 25% of the turn.  One good feature is the finial has a textured surface allowing for easier manipulation of the mounting caps.
Suggested fixes: 1 - relocate the mounting holes and 2 - revise the mounting caps shape on the sides to permit a wrench to tighten the mounting caps.