I was donated a 15-91 and was so excited, until later when I had tome to really examine her, only to find out that there is a gaping hole down there, no bobbin hook, nocase and no bobbin, naturally, nothing to hole it. The case and the bobbin are easy to replace, not so the hook. So, she sits in the foyer, useless for now. I do have a 15-90 in a Queen Ann cabinet and she sews beautifully. I could rob her, I suppose, but am reluctant to displace her from her rightful home.