Chair Slider for Round Feet

UPDATE 1: I went through several iterations after the first design, and the latest (v8) is intended to maximize the pad lifetime: it gets thinner with time, so at some point the rim starts scratching the floor - I added an island as high as the brim, so scratching won't happen, but the lowered space around the island presses the pad into the brim and should keep it in place.

UPDATE 2: The clips are encapsulated inside now, so it is a bit more bulky, but nicer to look at.

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