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It is a small metal button on the side.

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Small spring loaded button located lined up with the shaft of the knob, located on the switch side of the dash.Pull headlight switch on fully, depress the little button, push in slightly to release pressure, and knob and shaft will pull out.
Replacement? Shove the knob/shaft in.
When you get the knob/shaft assy out you will see the groove in the end that holds it in place.