Merax MS199736 Manuel De L'utilisateur page 38

Use two carriage screws M8*65mm (54), arc washers M8
(42) and high cap nuts M8 (55) to connect the front corner
tube (32) to the front main frame (1);
Tighten the cap screws after the two carriage screws are
completely done.
EN
Use two carriage screws M8*65mm (54), arc washers M8
(42) and high cap nuts M8 (55) to connect the rear corner
tube (31) to the rear main frame (5);
Tighten the cap screws after the two carriage screws are
completely done.
38