3.
Lift Expansion Shelf 1, attach it to the metal bracket on the Basic Shelf, and slide it backwards until it locks.
1
2
Metal Bracket
4.
Secure Expansion Shelf 1 to the metal bracket with 2 screws (B).
Screw (B)
Installation Manual
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3.2.6 Installation of 3- or 4-shelf System (Tower Type)