yes thearrow goes inside the metal ring (cradle). If you place the fleece that is provided on the cradle all the way around you can shake as much as you want and it won't make any noise.
Man I'm thinking I really like that rest. Another question, obviously that photo is full draw. When not drawn at all does the arrow just sit down in the V shaped section? Upon release I'm guessing it (the rest) kinda stands up with the V pointing down and your cock feather would be pointing down. And there is no fletching contact at all? Was setup and tune relatively easy?