When you get your device I would suggest you look at your security screws.
Insert the wrench into the screw; see how it fits and how it is supposed to snap into the head of the screw. You will see that the key seems to fit one way but will not go all the way in.
Turn the wrench till you feel it click into place. Then push down hard while turning the screws.
If you follow these instructions you will have no issues with your screws.
You will see that I have given you some extra screws. If you feel one wearing out, replace it.
The screws and wrenches should last you a lifetime.