I bought a new bobbin case (verified for the correct one) for my Singer 6104. When I hold it in with my finger it sews fine, but when I put the lever over it that holds it in place it locks up.
By Gloria
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The packaging for the new case was labelled incorrectly - take the part back to the shop along with your machine and show them it's not the right one. If you bought the case online, take pictures of the part in the machine, and email the company.
And if you ordered this directly from SingerCo, you need to let them know this part and the lot it came in with is mislabelled. They'll take care of the problem for you but it may take a few weeks - be sure to keep a note of the lot number on the incorrect part so that you can check the next one before you even open the package.
The reason it works when you press on it with your finger but not when the lever is closed is because it's the wrong one - the weight of your finger compensates for the incorrect size but when the lever is closed and the case 'seated', it doesn't really seat. A millimetre difference is enough to cause the problem you're having.
You need to find a Singer trained repair tech in a sewing centre - he/she will be able to source the correct part, and will keep at it until it's right.
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