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?
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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.
swampwalker - the corian might be the ticket. I would be concerned with plywood and the steel castors either getting stuck or being tough to roll. The Corian would not have such a problem - question is, can 1/2 Corian be difficult to locate? I will give that a try if no other options are available.
Most large hardware or home improvement stores have disks intended for sliding heavy furniture. They come in different sizes from an inch or so up to six or seven inches diameter. They made from a very hard, slick white plastic that looks almost like teflon. They're flat on the top and slightly curved on the bottom. You tilt up one side of the furniture and put two disks under the legs, then repeat on the other side.
Here's something similar on Amazon.
I would use 2ea Hand Carts with phneumatic tires. Place lip of each cart at each end of rack. Place thin piece of something on bottom of rack to prevent the cart's lifting lip from scratching anything. Use the lever action of the carts to lift high enough and roll it on over to where you way it. Have a 3rd person steady the rack.
Get those plastic tracks that refrigerators are moved on. You lay them on the floor and the fridge rolls/slides on them. Like the furniture gliders, only on about 2.5' tracks that are about 4" wide. They interlock too if you need to go further distance. They'd likely be at any home improvement store. If the rack ends up in the closet ontop of them, so what? Ready for removal at some later time.
My rack doesn't weight quite as much as yours, but it is still a couple hundred pounds, loaded. I do not use casters but points. I have the discs that the points go into and felt adhered to the bottom of the discs. These allow my whole rack to slide nicely on my wood floor, especially if you are sliding with the orientation of the wood (not grain, but how it is laid).
The plastic disks Sfar mentioned, also come with a heavy felt like material on their bottoms for movement over hard flooring. While masonite may be the ticket, plastic movers have proved invaluable to my wife and I.
It took three men and a boy to move a new very large door chest into our bedroom. They were lifting and lowering and angling it to go around a corner and beneath a door way. Later, my wife and I put it on the plastic disks, and slid it out of the room over carpet and ceramic tile with ease.
I suggested the disks to a buddy to move a machine lathe in the 600-800 lb. range. They worked quite nicely.
These may not be for your use, but we use them several times a year. In fact I just moved a piece of furniture with a 50 plasma on it couldnt have easily done it without those little guys.
A really simple and cheap solution: Put a couple of folded towels under the unit. It will slide easily over the floor and there will be no dents, scratches etc. I have 350 pound subwoofers that I have moved this way. I have no strength in my arms or upper body whatsoever, but this way I can move them myself.