I know Matias made a nice switch, but if the key were a bit more stable (less wobbly) or the keycap didn't touch the switch housing I bet it would be near dead silent. The mechanism itself is ridiculously quiet.
As the Matias guy told us earlier, there is nothing to stop us from trying O-Rings to see if it improves the dampening.
I removed one keycap and played with the switch. I don't think it is the keycaps itself that is wobbly. The keycap seams pretty well attached to the "shaft".
It is more likely the tolerance in the switch itself.
![Matias Quiet Pro vs Topre RealForce - Quietness Field testing 5289-0](https://geekhack.org/index.php?PHPSESSID=361ndros2l1np73vp5std64b95g8rlcu&action=dlattach;topic=36095.0;attach=5290;image)
This is not an actual Matias switch, but just to illustrate what I mean. On the Matias I noticed that the white piece had significant side play in the black housing. Enough to explain what you called wobbly.
We can have Matias to confirm, but I suspect the keycap never touch the black housing. Most of the sound we hear is the white part hitting the housing and reverberating in the keycap. I'm not even sure O-Ring would reduce it. That kind of tolerance is probably required to reduce friction and make sure the switch performs well cycle after cycle after cycle x 40 million times
![Kiss :-*](https://cdn.geekhack.org/Smileys/solosmileys/kiss.gif)
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