I was having some challenges with my sewing..discovered a small piece of thread stuck under the thread tension on the bobbin.. I used a piece of card stock to slip under the tension bar on the bobbin case and there was a tiny piece of thread..now it works great again..tiny, tiny pieces of lint or thread in hard to see places can cause machines to sew uneven, skip stitches etc.. So wonderful when machines work great!!! so frustrating when they don't!! Happy Sewing everyone!!