Series III military light switch

[Tony in MD]

I need a link for the wiring diagram for a Land Rover Series III Military light switch

My light switch requires depression of a pin that is inset into the switch handle before the indent pin can be moved. Am I missing a part of the switch or is the only way to change the switch function from clockwise rotation to counter clockwise to push the pin in with a pointed object while at the same time pushing the square indent to the left or right

TIA, Tony in MD

[Les Parker]

I am confused by the description you have given, do you have a pic. of the part that you can share?