When my mother gave me her Singer 15-91, she gave me all the attachments she had. So when I got home with it (she was in Seattle area and I live south of San Diego) I was spending a day re-learning the machine, the button hole maker, the zig zag maker, and all the little pieces - but one box of items just didn't work -no matter how hard I tried, I couldn't get them attached. Called my mother to find out how what I was doing wrong. She said it was something her mother bought and she had no idea how to use them. My grandmother never sewed anything except maybe mend a seam or hem. So when I looked closer at the attachments, and there on each one was a "W". I may have 7 sewing machines, but none of them are a "White" and not of them can use the attachments. So even though it is against my up-bringing, the box of attachments went off to a thrift store.