To remove the the knob - shaft assembly from the switch, there is a small button located on the side of the switch assembly itself. Once you push this in, it will allow the knob- shaft assembly to disengage the stop at the end of the shaft ans to be removed from the switch. This will allow you to remove the switch assembly from the dashboard. Once you purchase the new switch, inspect it to find the location of this button - release mechanism, which may be similar to the one in the dash. My 15 yo self spend a good afternoon of quality time learning this with my starter car - a 74 Duster ; )