I'll add that the Les Andrews blue book "Trouble Shooting and Diagnosis" has excellent descriptions of how to easily voltage test the Model A Starting System and all the other systems too. The diagnosis procedures described will help the novice perform the steps in the proper sequence as a skilled mechanic would do.
The overall health, state of charge, of your battery would have been your very first step in resolving the dragging starter issue. I'm new to the Model A also. When I can't sleep at night. I pull out this manual and review its contents. Over and over and over! (I don't sleep well. LOL)
Hope this helps someone.