I just received my VESA mount apapter kit from imacmount.com and it doesn't fit! I hope I'm not missing something obvious but the locking ring assembly O-ring does not line up with the inside of the hole in the stand. Anyone else had this problem too?? I hope I don't have to return it as it's such a nice bit of kit and I was very excited about finally securing my new iMac. I live in Japan so as you can imagine, securing expensive hardware is a must!