The pedastal stuff with obvious screws is just a blinder.
On the upright rear face of the donut, warm and remove a piece of chrome
trim at the bottom. Get a dart point in the corner after heating the
perforated metal grill with hot air and prize off. Go around the the
whole mesh like that and when that is removed 18 large screws hold the 2
main parts of the donut casing together.