You know, I was seriously about to loose my "you know what" because of this problem. I didn't look on the web right away because I experience has taught me that specific little hardware challenges like this one typically aren't documented very well online. So, after struggling for an hour yesterday and 30 minutes today, I go on the web and find your article.
This is the essence of what makes the internet good. People like RJ 713 who share their credible information and resources with those who are in need. A heartfelt thank you to you sir.
Of course, once I got the mount pulled back out the housing and attached my vesa mount and take the display upstairs to mount on my Bretford combo mount:
( http://www.apple.com/shop/product/TY174L... )
The screws and threaded holes on the arm are not compatible with the third party vesa mount I ordered. I ordered the third party vesa mount instead of the overpriced apple one to save $20.00 I'd like to be able to go back in time and slap myself silly.
Does anyone have any tips on how to avoid the compulsion to buy a slightly cheaper off brand part?