I just bought this machine today. The first thing I did was to put the casters on because I intend to keep the machine in a closet and roll it into the kitchen when I use it (I live in a small NYC apt). The casters are TERRIBLE! They barely roll, even on kitchen tile, and they won't roll at all on a carpet, even on a thin mat. I removed the rubber ends to the stationary feet and that helped a bit, but not much. Plus, the wheels only roll forward and backward, not at all left or right, which means you can't make turns. Does anyone have any suggestions? Change the casters? What else will fit? Get a dolly?? Help!