Thread keeps getting jammed, causing birdsnesting, eyelashes and skipped threads depending on whether it's low or high speed. Adjusting the tension did not help at all there was a small nick on the bobbin case (it's top loading) that I noticed AFTER I broke the part of the case above the tension screw. I've ordered a new one if that doesn't fix the issue is there anything else I can try?

Elisabeth, December 2015