4
Fig.3: Using screw (E), flat washer (J), nut (I) and ball nut (K) to connect bottom support (5)
with front leg (3) and back leg (4).
Fig.4: Insert the back support 1 (6) into the tube of back support 2 (7) by using screw (G), flat
washer (J), nut (I) and ball nut (K) to connect the back supports (6 and 7).