Bruce, good point. There must have been some sort of inition written instructions prior to the change letters. There were, however, some assembly plants that changed assembly protocol due to local plant conditions. So, how was the protocol developed? We do know that there were Rouge men that would travel to outlying assembly plants to assure compliance with procedure, and some would return with a "better idea". Was it simply that assembly Foremen were so tuned in to "the method" that yearly changes were just a mild exercise in ingenuity?