My ’34 convertible coupe had the original wiper motor actuator mechanism removed, and I need to know the correct mechanism. There originally was a pull knob on the dash to the left of the instrument cluster with a “W” on it. That’s all I know. What goes between that knob and the wiper motor push-pull valve levers is a mystery. Was it a cable like the spark advance, or a bell crank mechanism or something completely different? Any help would be appreciated, especially photos. This is a one-year only design.