Originally Posted by
Luna Tique
... I have the original manual for using attachments that Momma Bill had but it is so old and so brittle I'm afraid to open it up to often. and every time I do another piece of brittle paper falls off. Luckily there was one bobbin and one needle in the machine. The bobbin is quite similar to the ones we use today.
....
Here are some links for Wheeler & Wilson attachment manuals pdfs
https://archive.org/details/Form21.S...rials/mode/1up
https://ia802306.us.archive.org/24/i...orm41_text.pdf
https://ismacs.net/wheelerandwilson/...ory-manual.pdf
Sounds like you can use Featherweight Bobbins, but you can't use the Singer 9W bobbin in a Featherweight.