How do you move a 650lbs Rack on Hardwood...

Not sure what the clearance on your casters or the MA roller casters is, but I had a guy build me a platform on which all my racks sit. That probably doesn't help you, but what it rolls on are the wheels you can get at Home Depot to put under your refrigerator. Might those casters be usable under your rack?

RCPrince -
Thanks for the thought. The door opening to the media closet is about 84". The rack with the steel ball castors is about 83", leaving me just an inch clearance. There is a small threshold between the main floor and the media closet. Media closet has fake hardwood (which is great for rolling on) but the actual floor (should the rack need any changes/modifications would need to be rolled out to) is actual wood. So I am trying to figure out if there is something VERY thin and yet strong enough to roll the rack ONTO and be able to move it around without denting wood.

Now, if I get rid of the MA base and have one made, that would work, but also would require me to get the rack out of the media closet, which still leave me stuck with what to do in removing it.

Thanks!

HOw about a 1/2" sheet of corian or other hard synthetic, or even a sheet of 1/2" plywood?