[Benson]

As mentioned above ... short trips, cold, and humid weather make this problem worse ... no time for vapor to evaporate.

Henry Ford was thinking about this problem 83 years ago.

Engineers added a notch in the Model B distributor housing to vent the water vapor.

Notice cut at top of round part of housing in the upper part of the housing to allow vapor to escape.

If I remember correctly this was done in 1930 or 1931 but maybe not until 32. See attachment of a Model B distributor housing.

FS Ignitions sells a stainless steel intermediate shaft which will help. I wonder if someone makes a stainless collar also?

Left click photo to enlarge: