In this video I show how I repaired the joystick on my Korg Poly-61. It had been crushed during transport and pushed into the chassis so it did not work.
The joystick has popped out of the X axis support X axis support, note the two metal tabs which currently are bent Tabs have been straightened to be able to remove the potentiometer Potentiometer removed Cracked X axis support Glued X axis support Assembled and Y axis mounted Joystick construction drawing from service manual