Shahinian Obelisk vs VandersteenTreo

As I suspected. If I understand your description of off center, you have a voice coil skewed in its magnetic gap. Good luck with your repair.
Cheers,
Tim

Yes, I suppose you are correct in your description.
 Thanks.  I will try to fix the problem locally, and if this fails, will send the driver in to RV.

@ja_zz 
I don't know what 'off center' means, in this case, but
Do you think it was damaged in the shipping?

It was generous for the seller to accept the speakers back.
He sounds like a 'Stand Up' guy.

For me, I would send it to Mr. V. as his drivers are made to his specifications and I would doubt anyone else knows what he knows. (I also wonder if he needs the driver from the other speaker in order to get them balanced)?-Ask Johnny. 
A second reason to send it back to California is that Vandersteen constantly upgrades their speakers and I am sure they would need to see your driver in its' pristine state in order to affect the proper repair. If you have it repaired locally, it may get altered so that should you still need to send it back, they might have a problem putting it back to original spec. as they don't keep records of their upgrades.(Though I wonder why they don't). Of course, I am being a bit paranoid, but I want to save you from anymore trouble. 
A third reason is that should you want to sell them, you would have all the documentation showing they were put back to original by the manufacturer.
Lastly:
When In Doubt, Contact Johnny R!
Bob

Bob,
It was generous, yes, but... overall not a pleasant type to deal with, the seller that is.
I am as "paranoid" as you are, believe me :-)
They actually don't have a database even of years of manufacture.  I told Richard the serial number, he couldn't tell me year of manufacture...
On the sidenote, strangely enough, the speakers are playing quite nicely with this midrange missing. Go figure.
A sideways question to you Vandy owners:  how would you describe the sound of Vandies? "Dark" is what comes to my mind...

Hmm, I supposed it depends upon what you were listening to beforehand.
Vandie's aren't bright (as in, lots of treble or beaming uppers).
Also being phase and time aligned, they give a more natural (in my opinion) sound. The closest I can find to them are planars and electrostatic speakers.
Again, to my ears.
Bob