SOURCE: Brother Sewing Machine model:CS8150 bobbin thread problems
The top of the machine is not threaded correctly. First raise the presserfot then rethread the machine. Bottom looping is usually caused by a lack of top tension. There could allso be a bur on the hook.
SOURCE: Bernina Bernette 65 sewing machine
Presumably neither of you has or knows how to adjust your bobbin tension so, I'm going to presume it's your hook. Make sure you are threading the machine coorectly then you'll need to remove your needle plate by removing the two screws, pull out your hook (this is the part your bobbin sits in) but make sure you note which way it sits inside your machine. Have a look at the plastic hook for any sharp edges or burs, you may need to replace your hook or try and gently sand (400grit) the plastic if possible. The key part of the hook is the small blunted point as this is what catched the loop of thread behind the needle. Please make sure that when you put your hook back in, that it is on the left side of that little guard sticking out on the lower right of your machine.
SOURCE: Brother Window Matic Model HA3-B5
I believe this is the manual that you need.
http://gotoes.org/sales/BrotherSewingMachineManuals/ViewInfo.pl?Brother=1&Sewing_Machine_Model=window-matic
SOURCE: I need to load the bobbin for my singer 247, I have no manual
I am a veteran seamstress and I may be able to help you. it sounds as though you just have the wrong needle in the machine or the needle is in backwards.. Machine needles are different lengths according to what machine it is. The needle could also be dull on the point. Try this and see if it helps. Also your local sew shop can help you no charge if you just go in and talk with them. The techs enjoy helping for the most part I have discovered.
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