I just did this setting up a switch for my EQN, and I turned it up side down and wiggled the knob while tapping and shaking it (over a dish to catch the pin in). It worked.
If it is really stuck, I have taken grayhills apart to manually set the stops (on non adjustable) and it is possible, but intricate. Don't drink too much coffee first.
i had same problem some time ago.... i had to disasemble switch, remove pin from hole from inside, and then assemble switch again.... it is not big problem, if you have steady hand.