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When a vintage sewing machine (the White Rotary 77 in this case) has the rare "hiccup" and does not function as you might expect, it can often be something incredibly simple. The Bobbin Winder Tire is most often easy to access and replace and the costs of replacement are negligible. Here, I show a quick and easy way to check to see if yours is still sound and optimal even if it "looks" ok.