3 ms·

That's what I understood from the article as well, but commenters below say they fixed it with a cotton cushion. That rules the piston out.

• b112 6mo ago
  It's possible there is more than one cause. My chair has a super thin, almost no cushion, so it's not the cause here I think.
  • shmeeed 6mo ago
    If I had to guess, I'd say it's probably the cover, not the cushion.