Organ needles are what are shipped with the Janome machines so no problem using them. I do like the convertable foot as well. I have had several Janome's -- the clip-on part of some of them are wider than others so some of the feet are not interchangable. There are different widths of the feed dogs so the the feet need to properly position on the feed dogs so it is a good idea to stick with feet that work with the ankle and feed dogs of your machine.