Is there an easy way to adjust wiper arms on a 65?

It's been about a year ago but I don't think I took it apart. I think I just had it bench tested to make sure it works. The 65 manual notes that "When adjusting the timing of the variable speed park switch, note that the variable speed motor rotates in reverse at the time the park switch opens. "Early" and "Late" directions are therefore opposite to single speed motors." So I don't really understand what it's talking about. Maybe that's what's confusing me. My variable speed wiper on this model has two speeds a low and a high. It and the wiper transmission are all located under the dash so it is easier to see what the system is doing. But I don't know if I put something back wrong or I'm shutting the wiper switch off and installing the arms in the wrong position. Definetly the most complicated adjustment I've done on a car.