Thanks for the clarifying responses! I was checking out an orphan bobbin to see if it would go all the way onto the bobbin winder. It sits flush with the top of the bobbin case, but in looking at pictures of other Elnas with elna bobbins in the case it looks like the top of the bobbin is lower than the edge of the case. So I will order some, although I read that repro bobbins may not work in the older series of machines. If 66 works better than 15, I have plenty of those! I've cleaned and oiled her, so excited to see how she sounds. Yes, I am going to replace the plug and transformer first ;-)