I purchased this Wooley Winder many years ago for my single drive Kromski Sonata spinning wheel. The manufacturer was highly professional, courteous and good natured. I use my Wooley Winder exclusively and I love it. The singles (or while plying) wind on smoothly and the best part is that I don't have to stop to feed the next hook. If course I use the Kromski bobbins and everything is absolutely perfect. It is such a pleasant experience spinning with my Wooley Winder doing its masterful work. What an amazing tool!!.