I believe the switch assembly is theaded and there is a nut on the back. You will have to hold the nut while you turn the front outside ring of the ignition. The ring should have three notches evenly spaced around the perimeter. I used a small pair of needle nosed plyors to catch in the notches to turn it.
Howard & Connie. USAF Retired
2007 Newmar KSDP tow Jeep 4dr wrangler
member of IRV2since 2003