401a bobbin chatter and tension issues
So I have a pretty strange tension issue and I'm hoping someone out there can help me! Recently I was hemming a t shirt using a twin needle. I had to loosen the bobbin tension quite a bit to get a good stitch. Ever since then I haven't been able to get the bobbin tension back to normal. The first few stitches will be nice and balanced but then the next few stitches the bobbin thread is too tight, then back to balanced for a few stitches, then out of whack again, and so on. There's also a clicky chattery sound coming from the bobbin area. It gets louder when the stitches are unbalanced. I've already cleaned and oiled everything and checked the timing, but other than that I have no clue what to do!!