Adjust the dumbbell to 15LB and remove the dumbbell handle.
2. Slide the outer small chassis to the inside, lift up the middle chassis (including the weight piece) and turn it around, placing it next to the other weight pieces so that the grooved surface snaps into the convex surface.
3. Repeat these steps on the other side, place the barbell in the middle, and make sure it fits into the slots of the weight plates on both sides.
4. Complete the conversion.