Hi Tyler,
There isn't much to it really, basically that little brass fitting on the end of that lever where the throttle cable slots into on the carby. It is not connected or in an open state to the wire fitting that's connected behind it that runs up into the flywheel area. When you use enough pressure on the throttle cable in the fully closed position, it actually slightly pushes that little brass pin inwards slightly which shorts it out and connects that wire to the body of the lawnmower through the original metal throttle cable. Well when it's working and adjusted properly anyway..lol
I thought about stripping some of that plastic coating off the throttle cable near the carby, then I remembered these carbies also have that plastic inner sleeve where it sits on the intake. I think this also makes the metal carby electrically isolated from the engine. I might just have to run a wire from that steel bracket on the carby inlet to somewhere on the engine. Then I think when the throttle cable is fully closed it should complete the kill switch circuit to ground and stop the engine. I will first try to strip some plastic from the cable near the carby and test to see if in the closed position it connects to the carby housing, if that checks out then I will just run a wire to connect the carby housing to the engine.
Also I am amazed that these kill switches are original and still working almost 50 years later! lol. They made these things to last that's for sure!
Cheers!
