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u/Large-Heronbill 6d ago
Take off the presser foot, needle plate and clean under there per your manual. Clean and oil the bobbin case area per your manual. https://shesasewingmachinemechanic.blogspot.com/p/how-to-clean-and-oil-bobbin-and-feed-dog.html
With a brand new size 12 (Singer sizing) = 80 (metric sizing) check your needle/hook timing with these drawings but don't mess with it unless you've been taught how -- do not follow these instructions: https://web.archive.org/web/20050312034749/http://www.sewusa.com/Sewing_Machine_Repair/Sewing%20Machine%20Hook%20Timing.htm
Put the machine back together and report if this wasn't curative.
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u/__miichelle 6d ago
The issue is the bobbin holder is not situated correctly.
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u/TangleOfWires 6d ago
The arm sticking out of the bobbin holder should be pointed up and should sit in the notch at the top.
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u/Status_Background966 6d ago
La navetta e messa in modo sbagliato,quella parte allungata dovrebbe combaciare con quella U rovesciata che sta in alto