Oh, I am so glad you asked and also that someone knows about them - - - I got one at Goodwill and am still getting acquainted with it. I have a manual that says "generic to the machines of that era" (something like that) - it doesn't take you button to button (I wish it did). I have gotten a pretty satisfactory seam - and in fact decided to leave it downstairs in a corner of the diningroom (it's pretty) and since winter will be here soon and I like to be able to sew upstairs and downstairs where the family is. I am so glad somebody knows about them.
:-) Wonderful!! I have bookmarked this message to come back to.
Marysewfun