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Replacing a gear in Singer Stylist 457?

I've discovered that the top gear, that turns the bobbin has crumbled, so the bottom wheel turning the bobbin is dead. Is it possible to replace this, and is the part still available?
Yvonne, February 2018
https://www.sewingpartsonline.com/singer-457-stylist-sewing-machine-parts.aspx

dxsvdsasa, February 2018
link Click here to see other fixes for Singer.