Sometimes, there is still gunk where it doesn't belong. I know bkay thought she had a bobbin case cleaned and then found out that it wasn't as clean as it could be.
Bobbin trouble on Singer 403
Granted, it is for a different bobbin case, but the principle is the same.
Also, there could be stuff under the tension spring - do be careful. One way to clean can be found at
https://singer-featherweight.com/blo...ase-yo-yo-test
Janey - Neat people never make the exciting discoveries I do.
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