A pole [A] is installed from the top to the bottom of the front side fence of the 2,000-sheet tray (2nd tray).
Consequently, rattling from the top part of the side fence is reduced, and it is easier to align the side fence with the width of the paper.
A pole is not installed in the 1,000-sheet tray (1st tray, or 3rd tray) because the side fence is short and little rattling occurs.