I owe this trick to an excellent fan restorer, Kim Frank. We all put rubber feet on the bottoms of our fans but have you ever noticed that these feet will mar your furniture and prevent the fan from sliding easily?
A simple solution to this problem is to apply a felt pad to the bottom of your rubber foot, one which is the same diameter as the foot. I picked mine up at McMaster Carr but you can also find these pads at Home Depot or Lowes, sold by the Waxman Group.