The non-magnetized screw was very difficult to install. This is how I ultimately succeeded:
Install the two magnetized screws first. They are easy because the magnetized screws will stick to then end of the screwdriver. They will hold the cable bracket in place.
Place the third, non-magnetized, screw on the center of the cable bracket. Take a toothpick and nudge the screw toward the screw hole. The threaded part of the screw (the shaft) has enough weight that it will fall into the hole, and the head of the screw will be pointed upward. You will then be able to use the screwdriver.
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