Step 3
1.Attach the two Armrests (No. 19) to each of the Extend Arm (No. 13), secure them by four M8 x 70 Bolts (No. A4) and four Ø10 Washers (No. B2).
2.Attach the Backrest Board (No. 20) to the Upper Cross Brace (No. 12), secure it by two M8 x 40 Bolts (No. A5) and two Ø10 Washers (No. B2).
5