Step 1: Requires 4, 5, 6, A and C Insert screws (A) through the right leg frame (4) into brace rails (5 and 6). Secure in place using the hex key (C). Step 4: Requires 1, 2, 3, 4, A, and C Position the back (1) and the base (2) on the assembled frame as illustrated below. Insert screws (A) through leg frames (3 and 4) and into the back (1). Secure in place using the hex key (C). Note: do not fully tighten the screws at this stage.