I am rebuilding a timber-framed 1932 1 1/2 ton truck built by GM-H in Australia. The timber doors have a half-inch wide slot for window glass but I don't have winder mechanisms and cannot see how they would have fitted. I don't know whether it would be the same as a Fisher cab. There is nothing in the Filling Station catalogue. I wonder whether they were wind-up or pull-up. Can anyone point me to a reference?