The hang up is only part of the problem . The bobbin winder only winds half a bobbin ! Stops and won't wind any more . I always use the same thread [ upper and in bobbin ] .But thanks for the suggestion . I have tried different brands of thread , no effect .
Figure this out . In the book , says class 16 bobbins , not the right ones ! They won't fit in the bobbin case ! And yes they are singer bobbins . I don't mix and match them . Annie