The video shows how to 'prevent' a working joystick from going faulty.
If yours is drifting, you need to replace the potentiometer, and also apply the fix from this video!
I bought my replacement potentiometers from mouser electronics (link below) - the shipping was quite expensive so i bought a pack of 20 to make it worthwhile.
These work for the yaw, pitch, roll, and strafe axes. Works for the throttle too but the range is slightly incorrect so you will be at +100% throttle when the lever is at the ~75% position.
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