YOTRIO 68845704 Instrucciones De Montaje página 4

Place the chair on a flat, protected surface. Connect Joint
pipe (E) with M6*35mm bolt and washer (F) to left arm (B)
and right arm (A), tighten on one hand.
3
Tighten all bolts with Allen wrench (G).Don't overtighten.
Excessive tightening may cause peeling and cleaning of
bolts