Sew our favorite quick and easy top for FREE this spring!
www.seamwork.com/issues/2016/12/clean-your-bobbin-case
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Unexplained holes in the case of the machine are probably also for oil.
or break your bag.
Episode 166: How to clean, service, and care for your sewing machine. ... You can clean and oil it yourself in most cases. The frequency depends on how much you sew. If you sew daily, aim to clean your machine once a week.