Richie,
Welcome to the Forum.
Not sure I can answer your question but hopefully one of the more experienced folks will comment.
When I have pulled my Dizzy, it turns freely.
Are you aware that with some pertronix set-ups you need to file a corner of the plate so that the unit can seat properly? You will find this info on this site. Not sure if this would be inhibiting the shaft from rotating fully. Something to check before you take it apart.
Again, hopefully others will comment.
Best,