Gymrex GR-MG 53 Manual De Instrucciones página 20

a) Seat the stabilising fastener (3) between the side frames (1, 2). Apply the
reinforcing plate (10) on the outside of the right frame (1). Align the axes of
the fastener, frames and plate holes. Fix the structures with M12x70 screws,
M12 washers and M12 nuts. Slide the washer onto the fixing screw. Move it
from the outside of the frame through the hole axes. Attach with a washer and
nut from the inside.
The left frame (2) with the fastener (3) is installed in the same way.
b) Place the backrest support frame (4) between the side frames (1, 2). Repeat
the above-mentioned procedure to assemble all parts.
STEP II