I'm going to defer to Bkay as well. If you don't have the correct cover plate for the buttonholer option, let me know I -may- have an extra. I should probably limit my comments on this model. 401's and I don't get along well. I'm fine with the 500, or the 403. It's probably just me. I have one left (of 3) still on the bench and can't get it to pick up a stitch for hours of trying. Come to think of it... I may have a parts machine. (insert evil giggle).