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Verify that you have threaded the bobbin case correctly.
Be sure you have installed a brand new needle.
Remove the top thread completely from the machine.
ALWAYS RAISE THE PRESSER FOOT and rethread the top from the beginning.
Use your hand wheel and turn it. Monitor under the throat plate. The part you see moving will eventually show an opening. Stop there and install your bobbin casing. If it has a little metal piece across you will have to lift it slightly. After it is snug you can install the bobbin.
It sounds like the lower shuttle is out of place. You should be able to take out the bobbin case and unlatch the shuttle. It will probably be in 2 pieces. Clean out the dust behind it and replace the shuttle pieces. You may have to fiddle with it a little to get them back in place. Then you can test it by manually turning the wheel. Make sure the bobbin is placed into the bobbin case and that the bobbin turns in the direction that you pull the thread.
I had the same problem with my singer 20u professional. I tried to find the answer here but no help but I made a call & she said the bobbing might be too big fer the bobbing holder. the bobbing holder is the round metle thing that fits in ure machine. u have to make sure the bobbing ( the thang that holds the thread is the exact same size as the bobbing holder. Hope this helps.
On a 1600 the bobbing case should not turn. the metal around it should. It should remain stationary.
The part thet turns is called the hook. Is the hook spinning. Is a new needle in the machine? That is where I would start.
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