Precision Flight Serial CAT I and Microsoft Flight Simulator 9 (2004) - Manual (Page 15)

Set Up Guide for Serial CAT1 and FS2004 Page 15
E. Enabling the quadrants
1. Click on Throttle Quadrants tab.
2. Scroll through the list by clicking on the arrows.
3. Enable the levers that you own by clicking on the Quadrant Enabled check box on the left side.
4. Disable the quadrants you do not have by unchecking the box.