Saitek X52 Spring Plate
If you own an X52, than this is a no brainer. The spring on the Flightstick was never very stiff to begin with, and over time it only gets worse. This will compress the spring and give the stick more resistance.
My prints don't interfere with the sticks range of motion when I check its calibration in control panel, but your mileage may vary. Install it with the text facing rightside up. Help the spring, and base into place. It is a snug fit.