I've just been trying to get my new Featherweight up and running and had a horrible half hour because the bobbin thread appeared to be jamming. Peering closely at the bobbin and comparing it with another one revealed that it was a very slightly different size, and with the other one, the machine ran beautifully. Phew! However, I only have a few bobbins. I know that the Featherweight takes standard modern feet - are the bobbins still easily available as well, or do I have to go to a specialist supplier? And how do I know which is the correct one to buy - the one that wasn't the right one was only very slightly different.