Some time back I started a thread about needles and bobbins.
http://www.quiltingboard.com/vintage...d-t180420.html
In post #9 I put in a couple pics of a bobbin we'd gotten but didn't know what it fit. Nobody else did either.
Today I got out our Featherweight to play with it and decided to compare bobbins. The unidentified bobbin was the same size as the FW bobbin so I put some thread in it and stuck in the FW. Works just fine. So if you come up with some of those funny skinny bobbins, try it in your FW.
Joe