There is a cable that runs down the stearing column where the swith actually mounts. when you move the lever a small arm gets rotated up or down and pulls the cable which gets clamped into the back of the switch. You need to get it set correctly so that when the turn is canceled the switch is centered up. If you don't then your brake or tail light won't light up. I don't remember which one. I never did get mine set right. If I turn right I have to switch mine to the left and then off so it work correctly. When you get the parts or take yours apart you will see how it works.
