Another question: The socket has an additional outlet (U.S. type). Is this outlet switched by the pull switch or is it constantly powered?
Very observant question. I believe you might be looking at my original posted photo. Actually, I have two types one with the power outlet and one without (pictured below). The one with the power outlet has the power outlet constantly powered on unaffected by the switch. I think I am starting to see this mechanism more clearly. I may need to dismantle the mechanism, if that is even possible. OR.... maybe not use the Shelly on this project. I am still surprised that no one else has looked at this. But then again, it is an old technology.