With the machine upside down, locate the two (2) M5 roll in t-nuts (preinstalled). They should be pushed all the way to the front of the machine.
Place the spray arch, the 90° Corner Brackets face toward the front of the machine as shown above.
Install the two (2) provided M5x8 bolts into the 90° corner brackets and tighten them. Loctite has already been applied.