When assembling the frame of the machine in the following steps, pay attention to the orientation of the holes in the back posts. Also, the illustrations show the back extrusion profile (the long 20mm x 20mm piece) from various angles. Pay attention which side is the front (in) or back in the pictures.
Take the back extrusion, the one you tapped earlier. Slide the thick brackets to the back extrusion bar as shown. Please note, that I said you can have the screws in to the ends of the profile,but the image does not show them.
- 767mm extrusion