At the first opening, unknowingly, I damaged both thumbs)) As I already wrote, the design opens and gets into the working position rigidly. I did this process incorrectly, as a result, both fingers on opposite sides were fixed between the spacers and the seat arc. It was like in a vice, both hands were shackled, it was not possible to fold the chair)) Due to the rigid fixation, the pain was intensified, I didn’t think of anything smarter than pulling my fingers out, so the abrasions remained sucSee full review