I picked up a Samsung HCL473W 47" Rear Projection TV and although I love it, I'm a little confused by some accessories. The set came with 4 black disks about 2" inches in diameter with no markings. I have no idea what to do with these, as they aren't mentioned at all in the manual. Maybe they're for under the TV's wheels, but I really don't know what purpose they would serve there. Does anyone know what these are for, or should I call Samsung to find out?