As AskAlice said there's no such thing as a universal bobbin. I've used the company she recommends and have always found them very helpful.
Further to my earlier post I was asked to take a bobbin to a class and my Bernina bobbin didn't fit the rubbish machine used in the class. I had to buy a bobbin from the tutor which, of course, didn't fit my own machine.
A drop in the ocean in the great schemes of things....but replicated by how many more


