Michael J. Mahon wrote:
A typical pot will require about 270 degrees of rotation for full
resistance, but a joystick usually provides only about 30-40 degrees,
necessitating use of a higher value pot.
It's also often helpful to connect a second, physically small, higher
valued pot in parallel to the main pot, to fine-tune things. Combined
with the usual sliders in the stick, this makes it easier to get the
stick into a state where the reading is really 0 at one end, 128 in the
middle and 255 at the other end of the scale.