Note: This step should only be performed if the size needs adjusting.
- Remove the screws - With the NavVis VLX in the box, remove the two screws with the torque wrench provided.  
- Adjust the size - Slide the belt hook to the correct size. The device can be adjusted to the following height sizes: XS (Extra Small), S (Small), M (Medium), L (Large), and XL (Extra Large).  
- Tighten the screws - Install the two screws with the torque wrench provided. Keep turning until you hear a sharp click. 