I had a problem with the amount of M5x12mm screws in my Kit.
I found out that I could use M5x15mm screws (had way more than I needed) to attach the End-Plates to the C-Beams. After that I used the M5x12mm screws to attach the 2040 extrusion to the End-Plates.
Screws are switched in the instructions:
- Blue are the M5x8mm
- Red are the M5x15mm screws