Probably a bit late for you but might help others: https://www.youtube.com/watch?v=Brk_ClBKpXM
Often with mechanical sewing machines it's a case of opening up your machine, cleaning it and oiling all the moving parts (related to the action that is not working, and everything else while you're there) and working the oil into any parts that look seized.
This video shows another sewing machine which will not reverse which has the same fix (open it up, clean it, oil it, work the oil in to the seized part): https://www.youtube.com/watch?v=tyNltreIg6s
Angela
October 2025