My sister took a class from a guy who worked on vintage machines (any machine without a computer chip) and was an expert on Featherweights in particular. He spoke at their guild meeting and briefly talked about maintenance of Featherweights. She said the class was excellent and he showed students how to take apart the machine and clean and oil it and to troubleshoot. A lot of speakers know the history of vintage machines and how to deal with their quirks. Mayabe3 it would be a change from regular speakers your guild has.