Feet for the "Hauck" chair (for the tiltable model) to increase height just enough that our beloved vaccum robot (Roborock) can move under it from all directions. You can simply pull out the old ones with plyers. The large ones on the front just plug in with no tools needed. The ones on the back require at least one skrew. I just used two (I didn't know at design time that the small one also at a pin)
The author marked this model as their own original creation.