[rotorwrench]

The Model A Generator book by Paul & William Mcree is the best I've found so far. Be very careful how you record where the coils go. They alternate the winding directions for polarity in the case so a person has to get that right for it to function properly. I was involved in a lengthy discussion about that recently so there is a thread about that on here. Most books don't get into rewinding the field coils.