Bill has serviced or rebuilt clocks ranging from an 1890 Viennese wall clock to a mantle clock that was a wedding present to my grandparents in 1914. Did I mention a rebuild of a grandfather clock? His knowledge, both technical and intuitive, is why I won't talk to anyone else. Be patient; he's a busy man. You're paying for two generations of experience here.
If you have a good clock that's an important part of your family, call Gessweins Clocks. He does come to your home if that's necessary.