ZigZag Adjustable Attachment, Singer Featherweight (Vintage Original) thread whereas the Service Manual has

whereas the Service Manual has more expanded and exploded views of the Featherweight parts

rayon or silk

from The Featherweight  221 Factory

(you will need to specify the model - prices vary depending on model selection)

This is for the embroidery attachment only (not the hoop)

ZigZag Adjustable Attachment, Singer Featherweight (Vintage Original) thread whereas the Service Manual hasFeatherweight Tested Fanatic Approved! This little attachment is just too darling for words. This attachment is quick and easy to learn with a simple adjustment on the back of the unit, you can create a wide zig zag or narrow zig zag. Also, by adjusting the stitch length on your machine, you can have a long stitch or short, satin stitch. You can zigzag over cord, too! It still takes a bit of practice because the attachment is moving the fabric back