span style='font-size:18px'>Step 7 -/span>It's now time to install the lower headset cup by using the same technique as the upper. Align the cup's center marks with the center of your head tube and slowly beging to press it it. Again, be careful to watch for it shifting as you begin to press it into the head tube. Inspect both the upper and lower cups to be sure that they are sitting flush with the face of the head tube, and that neither have rotated, before moving on to the next step.