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The Flightsticks are a very good joystick, but reaching 254 before reaching the UL corner of the rectangle means that they can get to 254 at all. All potentiometers have a conductive portion from the ends of the high-resistance element to the connecting lugs. In the joysticks, the conductive (or low resistance) portion is longer, so that if the joystick goes 75 degrees, the high-resistance portion corresponds to, say 60 degrees.
Without having say, 5 degrees of "no change" at the extremes of rotation, after the trimwheel has been adjusted for the connected circuit's idea of neutral, the stick might have to go farther than the "box" to reach 0 or 254.
It makes little difference in most applications, but if you are worried, you might make your own joystick like the one I made for my Apple ][+. Use a geared-up regular pot with a handle. You'd need gearing to compensate for the disparity between the approx 90 degree travel of a joystick, compared with the approx 270 degree rotation of the pot, or you'd lose range.
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