What's the trick?

["Schotland" <schotbus@cyberenet.net>]

What's the trick to removing an original steering wheel center cap 
without destroying it?  

After years of parting out cars, this is the first one I've come 
across that is worth saving.  I'd hate to have to take Mr. Sledge 
Hammer to it in order to get the steering wheel off.

I've tried grabbing the aluminum piece underneath it with needle 
nose pliers and vice grips, but I just can get a good enough grip on 
it spin the center cap off.

Any suggestions appreciated.

Thanks,

Gary