What you have going on is probably a bobbin problem. The knots are
referred to as birds' nests and happen usually happen when your
bobbin thread gets caught on something in the bobbin area. To be
certain it's a bobbin problem, change your needle. Even if the needle
looks fine, it could be just slightly bent and still look fine to the
naked eye. If that doesn't solve the problem, take the fabric out of
the sewing machine and turn the machine wheel by hand. Watch what
happens thru the plastic window in the bobbin area, or if you don't
have a plastic window leave the bobbin covering off. Is the thread
catching somewhere and causing a bunch of thread to gather in the
bobbin area? Be very careful when investigating in the bobbin
casing/area-it's easy to chip things in there! Often times, a piece
of something falls in there and can be pulled out with tweezers. Just
as often, the bobbin casing is slightly tilted and needs to be
straightened or has a chip in it and needs to be replaced. You can
normally get a replacement on eBay, searching with your machine model
number. Also, check out SewVacUSA. If you need help replacing
the bobbin casing (it's easy, you just need to be careful), or if
these solutions don't work, leave me a comment. I check back daily,
so I'll get back to you within 24 hours normally. Leave me as much
detail as possible and I'll do everything I can to help you!
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