I really like how theses chairs look and they 
swivel nicely, however, they wobble back and forth when you sit on them or adjust yourself. Also, I'm not a big fan of when you sit on them the cushion makes a swooshing sound, like all of the air has been squeezed out of them. Kind of disappointing. Does anyone have suggestions on how to get them not to wobble? Is there a way to tighten anything?