Binding clips. I love to hand-sew binding, and these hold it in place perfectly. I also use them for hemming. I think they are just unpainted metal barrettes. Self-threading needles for burying short thread tails. 1/4" seam foot WITH GUIDE-used a plain 1/4" foot for 20+ years, got a #57 foot for my Bernina 440 a few months ago. It just makes it sooooooo easy. Also two indispensible sewing machine features: needle up/down, preferably programmable, by button, AND as a function of the foot controller; and built-in dual feed (IDT)