Step 5. Lay top (part D) upside down on a soft surface, such as carpet, as shown below. Attach assembled unit (parts top (part D) using bolts (part #1) and Allen wrench (part #2). NOTE: It is important to adjust levelers once fully assembled and upright. Extend adjustable leveler until it's firmly in contact with the floor. If relocating, adjust leveler as needed until it's firmly in contact with the floor in new location. Step 6. Carefully turn unit upright.