Issue setting up Graham Phantom II Supreme

Haven't posted here in awhile, but still lurk quite a bit. I'm a bit of analog newb, but just splurged on a really nice used Brinkmann Oasis table with Graham Phantom II Supreme arm. I'm having all kinds of issues with the setup.

As you can see in the video below, the arm is exhibiting this herky-jerky motion as it moves. It's far from smooth. Even when I remove the entire unit from the base along with the arm wand, it's still jerky rather than smooth.

To my amateur eyes, it looks like the pivot housing and the piece that attach the housing to the Magneglide are not flat. They look severely angled as you can see in the pics below.

Is this normal or could this be the problem? Any thoughts on how to fix this stuff?

As you can imagine, after paying what I paid for this, I'm beyond unhappy. I would definitely appreciate any help you can provide as the dealer apparently can't have someone local come out until next week (at my expense).

http://youtu.be/MvcCR_dH0VU

http://i1276.photobucket.com/albums/y464/Brian_Gupton/armissue1_zps8abef27d.jpg

http://i1276.photobucket.com/albums/y464/Brian_Gupton/ArmIssue2_zps3b7cc028.jpg