I was looking for some wheels to put on my Tempest cocktail since it weighs a metric crapton. I found these and they work like a champ:
http://www.amazon.com/gp/product/B002IDWWPS/ref=oh_details_o01_s00_i00 . They screw right into the place where normal leg levelers screw in. Now it is SUPER easy to move around the game room (aka the garage =p ).
Just wanted to throw that out there in case anyone else was looking to make their cocktail a little more mobile.
Cheers,
Mike