Originally Posted by nantucketsue
Interesting thread. I recently straight stitch quilted a baby quilt using my walking foot on the 4900QC but noticed many of the stitches were very uneven going from normal size to tiny. I thought maybe it was because I used a cotton flannel backing although the walking foot is supposed to eliminate this problem. There were no puckers on the back which I had hand basted,. I was considering whether to purchase the blue bobbin for FMQ, but I don't think I will bother. I also think Janome Customer Service in UK is very unhelpful. I love my machine for general sewing and piecing, but as a quilting machine it does not seem to live up to its name.
I'm sorry you are having such problems. All I can say is that I have found Janome Customer Service UK very helpful. I have the blue bobbin case which works perfectly. I also use a quilting machine needle which seems to make a big difference. I've read that either this or a top stitch needle are the best to use but not a universal needle.