Gymrex GR-CB 200 Manual De Instrucciones página 18

Step two "II"
1. Embed the backrest (A9) of the unit into the upper joint of the frames and
fasten using washers (A14) as well as hex socket screws (A13).
2. The seat (A10) should be placed on the lower base (A11) and fixed with washers
(A14) and hexagon socket screws (A13).