My first clue was my quilt class instructor recommending Aurifil thread for intricate piecing because it is a finer thread.Had been using Mettler thread until recently and I was thinking the change to 50 wt Aurifil could be just enough to cause stitch problems. Or did I just get lucky with rethreading after the needle change? Anyway good to find out others have done this and had positive results. Thank you quilting board!