Hey Alex,
You posted this in 2012 and here it is in 2017 and the same thing happened to me including the initial panic. Thank you very much for the solution. I didn't have a spare ethernet cable so I used cable ties as another contributor did. Your instruction was clear and concise and I wouldn't have gotten through this without it.
After I got the flange back up and carried on with the installation, the bracket wouldn't go down far enough by a milli or nanometer or so. Instead of using the supplied allen key, I went and bought an allen key set with a screw driver handle. It's narrow enough not to bang into the back of the screen and you can get a good grip on it and get some decent torque to be able to get the side screws to bite. They seem to need a bit of force and finesse to bite and grip. I finished them off with the supplied allen key never over forcing anything.
You really have to take your time and be patient. This is a poorly constructed kit that is necessary for a Vesa stand. I did two 27" screens. The first one was no trouble at all. What's all the hoopla! The second one was a patience tester and required some out-of-the-box creative ideas to successfully complete.
Thanks again for the method.
Yes, I had a drink when I was finished.
Whew!