I can rap the transmission box on the seat track where the cable enters and make the seat go all the way forward and I still can't get to the fastener! FWIW, my son is manager of engineering with a major manufacturer based out of Holland. Honor grad from the Georgia Institute of Technology. He says that design
engineers are the problem. They come up with the ideas and leave it to others to make it work. All I can say is that Benz has some that go out of their way to make something complicated.
I hate to have something that doesn't work properly and I'll figure this out one day. It just irks me that I wasted a beautiful Sunday afternoon on this thing and didn't do any good!