I have a Singer 478 Stylist special zig zig sewing machine.The bobbin is not moving at all. I just purchased the machine and it was frozen so I oiled it in all places and it unfroze itself, but the bobbin is not rotating like it should.
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It sounds as though the bobbin gear has given up the ghost. This isn't a home repair, so you'll need to take the machine to a repair tech. Be sure to ask if he/she is using a 'salvage part' (not as reliable, please trust me on this) or a 'new-milled' part (not sure if this part is still being milled but the repair tech should know and be able to source the part for you).
If the tech has to use a salvage part, I urge you to consider retiring your machine. Once the bobbin gear goes on a vintage Singer, the machine quickly become a 'money pit' requiring more time on the repair bench than putting in sewing hours. I'm very sad to say as I love vintage Singers so much I own a few service manuals and do limited repair-refurb for my Sewing 101 students over here in Scotland:)
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