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shark 30n stitch sewing machine?

I am trying to hem my slacks but the bobbin thread keeps bunching. I have followed the instructions but it still doesn't work. Can anyone help me? It' s shark model 412n.
Gena, January 2007
To stop the bunching I just used compressed air (like a keyboard cleaner) to clean out the bobbin compartment, especially the bobbin tension. I'm sure you have tried similar things, good luck.

Sarah, June 2007
link Click here to see other fixes for Shark 412n.