If you look at the button hole maker at the top where it holds on to the shaft it should say 'slant' if it will fit a 401 or other slant machine. There are a couple different kinds. One comes in a pink or green case - they load the cam from the bottom. There is also a professional button hole maker - it loads from the top. There is a professional button hole maker that works on short shank - it is marked 'straight' on the top where it attaches to the shaft. I don't know why but I like the one that loads from the bottom better even though you have to remove it to change cams and I can't tell you why I like it better.





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