Why a Bobbin Case Opener?

[@Sugarkryptonite]

Thanks for the video, Stephen. I have a Singer 111 and never knew what that was for...

[@boutch050]

Hi
Thank u so much
I was trying too figure what is the piece doing
So how to adjust it
I got Adler 269 and I can get it to work properly

[@MamukkoKinsale]

Thanks for the video.