Here you will use 12x M3 Square Nuts and 2x M4 Square Nuts for setting up the main frame.

Refer to the pictures on where to insert the square nuts. All arrows in RED are M3 square nuts. All arrows in GREEN are M4 square nuts.

Insert the nuts fully into the openings until the threads align with the holes for the screws.

As before, the nuts will most likely press fit and hold in place. If they do not, use a small drop of hot glue to hold them in place.