Locate the wingnut at each corner of the cushion as shown in the photo. Unthread the wingnut to remove. Lift straight up on the cushion.
View as seen looking up at the bottom of the cushion.

Locate the wingnut at each corner of the cushion as shown in the photo. Unthread the wingnut to remove. Lift straight up on the cushion.
View as seen looking up at the bottom of the cushion.
