The dreaded lower looper has done me in. I give up. I will have to ask for help. Sweet Kathleen gave me this serger. It has the original paperwork included in the box, it was purchased in 1987 from the Atlanta Sewing Center. It runs with a nice quiet hum, is metal and heavy and just has to be a good one. I just can't make it work. It just doesn't stitch ! Could it be Operator Error ?