Can't safely secure

I wanted to use this to mount my computer monitor to the wall, but the bolt/screw that you're supposed to use to tighten and secure the tv to the tilting bracket is unable to be reached behind the screen even with the thinnest screwdriver I had. I don't really trust the mount, as it's just a hook holding on at this point; If anything knocks or bumps the monitor, it would come crashing down very easily. There's also no way to adjust the tv to be level except for the bolt that mounts into the wall. I'll probably return this bracket and look for a different one with a slightly longer "arm," so I can reach behind the screen to attach cables and secure the monitor better.

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