2006 Hummer H2 Owner's Manual - Page 289

3. Guide the pins on the side step brackets into the holes in the vehicle's rocker panel protector brackets. If you have difficulty doing this, it may help to have someone hold up the step while you guide the pins into the holes. You will be guiding three pins into the holes with the fourth hole in the vehicle's rocker panel protector brackets empty until the next step. 4. Thread the knob through the remaining hole - first into the rocker panel protector and then into the threaded hole in the side step bracket. Notice: Threading the knob into the side step and then into the rocker panel will not secure the step. The step could fall off the vehicle and be damaged. Always thread the knob through the rocker panel first. After the knob is installed, try moving the step left and right to be sure the step is secure. 4-35