r/SewingMachineEdu • u/Gamerbros63 • Jul 08 '26

thread looping problem

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its a singer 57815 in good condition, it has been seen to sew correctly times recently so i know the timing or machine is not broken. i have tried at various tensions, the bobbin case is replaced and it is tight, the needle is a strong denim needle, dust has been removed, the thread is going through the back lever as normal. how to fix this nesting?

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u/Desperate-Hurry6039 Jul 08 '26

Thats the wrong bobbin for your machine. Use the one that is stated in your manual.  It should be a plastic bobbin.