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Remove the top and bobbin threads from the machine.
Install a brand new needle--confirm it is facing the correct direction.
Insert the bobbin into the bobbin case, thread it, and install it in the machine.
ALWAYS RAISE the presser foot and rethread the top--verify the threadpath is correct.
Set the top tension to the midway point--may need to tweak this for your particular machine once it is stitching properly.
Re-test your machine.
Make sure that your needle is ALL THE WAY up in the needle clamp and the flat side of the needle is away from you.towards the back.
Review the steps for inserting a bobbin in the bobbin case and raising the thread in your user's manual; if you don't have it, you can download it free at the Singer Sewing Machine site.
If you have done these things and you still can't get the thread to come up, then your timing has gone out of synchronization, and you will need to get a technician to reset it for you. If you cannot find a sewing machine technician willing to adjust a Singer, Sears supports all brands of sewing machine.
1. is the needle the right one for the machine? 2. is the needle properly inserted and oriented correctly for the machine? 3. Is the bobbin inserted correctly, so it unspools correctly for the machine?
If that all looks right, then take the needle plate off and watch the shuttle hook. It should be very close to the needle when the needle is at its bottom most part of the stroke. If it is well behind, your machine\'s timing is retarded. You\'ll need to take it in for adjustment.
Make sure there is no fluff/lint within the bobbin case causing the bobbin to stand proud. Pressure from the bobbin thread can sometimes stretch the bobbin itself.. replace the bobbin with a brand new one. Double check your threading be removing all thread and starting from scratch.
Looping on the top means there is no tension on bottom. The bobbin thread generally rotates counter clockwise. The thread must get under the tension spring. The spring must be adjusted equal to the top tension. This you will have to play with to tighten or loosen as needed. When you sew in a zigzag you might want to loosen the top tension slightly. On a regular basis remove the bobbin case and clean with a qtip. On the race put one drop of sewing machine oil. Clean the bobbin case and replace.
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