Invert the stool and place the ring over the inverted top with the flat edge facing upwards toward the inverted base. Be sure not to displace the wide rubber sides on the base while manipulating the replacement ring down to the flared metal. Start by folding over a small section of the replacement ring, placing the metal edge in the the rubber ring. Working your way slowly around the circumference, place the ring over the metal until you have about 3 inches remaining to seat. Using both hands, slowly fold over the remaining section of the ring, completing the installation.
Extremely difficult to install. It took a great deal of effort.