I have, hmm, four, I think, and my favorite is the one on the top left of your picture-the one with the adjustable thumb screws but no cams. They all make great button holes, but that one is infinitely adjustable for size, once you get used to the adjustments. If I want a different shape (which is rare), the Singer cams fit my Greist buttonholer that came with the Pfaff, and I have a full set of those, I think.
No, I missed one-I've got five. Which still isn't as many as Joe!
