I've been asked to make a presentation on timing methods for a Model A to our local club. I've got the Les Andrews method, the Marco Tahatras method and the NuRex (wrench) method. I understand there's a Ford method and maybe Service Bulletin updates on timing. Can anyone provide the Ford or Service Bulletin methods or links thereto or any other methods you use or know of , please? Also, please comment on the method you prefer and why. Thanks for the help.