Review on Computer chair TetChair Runner gaming, upholstery: imitation leather/textile, color: black/green by Agata Sikora ᠌

I looked for the manufacturer's website or some opportunity to contact and ask a question - I did not find it. So I'll ask here, maybe someone knows. Accordingly, since I started to burst this mechanism, then someday it will come back. In principle, it can be simply replaced (the leg, the chair itself and this mechanism are separate, removable). So, where can I buy this little thing separately? (The bubble in the photo is what I'm talking about, and the peeling paint is the result of my interaction between the hammer and this bubble in an attempt to remove it :D)