I am working on a 66 from 1947. I fixed the bobbin winder issue, cleaned it up, oiled it up and attempted to use it. Made sure the needle was in correctly and threaded right and attempted to sew. It would sew for roughly an inch and then the top thread broke. It did that like twice and the next time there was a thunk and the thread broke. I took it apart, checked the bobbin area, saw nothing out of the ordinary so put it back together again and tried to sew again. This time, there was a loud thunk, thread broke nd now it is stuck. Needle doesn't move, can turn the hand wheel with difficulty and the bobbin area doesn't move at all unless minutely counts for movement.
I am stuck and am in need of advice/help. Thanks in advance.
Chris