Mount the CBox

Slide out the inner rail (1) from each mounting rail as far as you can, press the first metal clip (2) to enable further sliding and then the next clip (3) and detach it completely from the outer rail.

Attach the inner rails to the CBox sides using the built-in slide clips. Pay careful attention to the orientation of the rail, which needs to be as shown in the figure. Make sure it is locked in place.

The inner rail marked A attaches to the right side of the CBox. The inner rail marked B attaches to the left side of the CBox.

Insert the rear bracket of one rail into the rear rack post. To do this, line up the spring loaded square nuts on the rear bracket with the square holes of the rear rack post. Press the lever to load the springs (1) and then push the rail towards the rear of the rack so that the square nuts go through the square rack holes (2). You may need to jiggle the rail until the bracket is in place. When the bracket is fully engaged, you will hear a click.

Adjust the rail length as needed and insert the front bracket of the rail into the front vertical rack rail. Make sure the square nuts on the bracket are fully inserted into the square holes in the rack. Push until you hear a click when the bracket is fully engaged.

The view from the front after installing the front bracket:

Secure the front bracket with a screw at the front. This is important to prevent the rail from sliding inward when you insert the CBox at the next stage.

Repeat the above steps for the mounting bracket at the other side.

Extend the middle rails on both sides of the rack equally so that they both just emerge from the front of the rails.

Alternatively, you can fully extend the rails until they lock into position. However, the next step is easier if you extend just enough and not fully.

Horizontally insert the CBox into the rails. Press the release tabs on the inner rails to fully retract the chassis into the rack.

Secure the Cbox using the thumb screw on the pre-attached front assembly.