screw coupling for 1/32° scale wagon

coupling for a railway carriage it includes -a hook with a square tail to be inserted into the head rail 3x3 hole (see photo for assembly) - 2 identical clevises a non-functional tensioner - the towing buckle -a wire for the axis of the loop. We have to hot rivet the axes I tested a mounted hitch: breakage at 2.6 kg load.