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Singer Concerto sewing machine model 9217 - bobbin thread problem

Problem with thread bunching underneath the bobbin case. Case appears damaged and I have ordered a new one. But what if this does not solve the problem. Are there any adjustments i will need to make?

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  • Tracy475 Feb 06, 2008

    Still does not seem to be working properly. Anyone got any ideas of adjustments I can make to resolve this problem?

  • ryanmcgavin Dec 14, 2008

    I have taken apart the bobbin case and put it back together again and again. The thread seems to wind around the bobbin hook and then get entangled in the rest of the machinery below. I know this has to be a simple fix. I just don't know how to fix it! I can stich about stiches then the needle is jammed and there is bunching of bobbin thread stuck in the teeth or whatever that is called directly under the fabric.

  • Anonymous Mar 15, 2014

    Is this a problem I can solve myself or does it need repair.



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This problem is common in sewing machines with plastic bobbin cases. The new case you've ordered will most likely solve your problems. I might suggest checking the point of the rotating hook, to be sure it is burr free.

Posted on Feb 01, 2008


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i was having the same problem. try putting in a new slide plate - the pressure from it holds the bobbin down, but it wears thin after a while. fixed mine.

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