I'm getting better at sewing but, I'm still running into two problems; First the top of what I sew looks fine (the face up part as it goes through the machine) but, the bottom part looks kind of "globby" with weird knots and twisted thread hanging underneath. Secondly about every half hour,or so, I have to stop what I'm doing and yank with all my might a big tangled knot of thread out from under where the bobbin thread comes out. Does anybody have suggestions as to what might be going wrong?
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