Paul in NJ
I haven't found a use for mine other than making....sash. For those that don't know, it is used for cutting the rabbet in window sash that the glass is set into. Another plane is used to cut the molding on the sash. It differs from a standard moving fillister in that it cuts on the opposite side of the work piece. There is good information in John Whelan's book "the Wooden Plane".