This has been a very informative thread. My 301 and I are just getting acquainted. She didn't come with any extras because hers had already been separated from her before the previous owner. But with the info from here, I have purchased some other feet to be able to do some fun stuff. My 15-91 "Fusina" had most of these attatchments, and I have tried a couple of them. Now I will try some more knowing what they are for.
My girl "Thelma" is a black long bed 301.
Thank you all so much. I have found my favorite thread!!