Hi Jlegge. I have noticed you are the Monarch expert here, we are having an issue with a Model 40-NC and are hoping you could shed some light. Our headstock has had a major failure and Monarch is happy to sell us parts but not any books. I have noticed you said they only built a few 40-NCs so I can see why they may not have documentation for sale. Would model 90 or 91 drawings help?