It will depend on if your bobbin winder has a little pin to fit in the notch or if it is just the "split" shaft that fits tightly in the bobbin...also my 306 was giving me fits the other day and I discovered the bobbin flanges were slightly "bent" and would actually contact the little finger that rides on the thread and kicks it out when it is full. If your bobbins are squeezed tight on that they won't spin.... Just something to look at.