I have a Singer button hole attachment that my mother had before I was born (before colour television) - it is a cumbersome beige colour thing, with drop in cams and it attaches to a Singer straight stitch machine also of the same era (always known as the Green Machine but I think it was actually called a Featherweight). It does the best button holes I've ever seen. I've tried lots of other machine button holes and they look ok, but these look just great. Incredibly consistent and not a computer chip in sight! long live the green machine!