Had thread behind the bobbin case last month. Can usually do these repairs but taking the screw out did not work.
Apparently only for SOME models -depends on date of machine. Took to repair who let me watch --took bottom off and there was 2 screws that had to be removed before that bobbin case would ever have come off. My hubby had seen this
video too--He said --See I told you it wouldn't come off the way it's quoted. Hubby broke the hook trying to remove it
But, the wife of repairman told him to just take the one from her machine --same yr 1949 and she could get another.
We were shocked she would do this but I was thrilled and it's still working. Even a book I had showed like that video
but that will not do it all the time. Good Luck to you
I know how you feel about repair people --went 3 and half hours on the weekend to get to one. Made a mini vacation out of it.