ZigZag Adjustable Attachment, Singer Featherweight (Vintage Original) newfw has one of the old

has one of the old style Tension Units then you might consider the option of switching it to a numbered tension unit

helping each person loosen the screws on their Featherweight machines

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Useful ideas for your Pinking Attachment:

ZigZag Adjustable Attachment, Singer Featherweight (Vintage Original) newfw has one of the oldFeatherweight 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