Wow, what an amazing tip. I have very bad neck and shoulders problems from a bad fall when I was 7 years old. I cannot sew for a very long time plus my sewing machine sits on my old mother's sewing machine desk, making the height very unappropriate. I will try this right away and I will keep you posted with the results.
Thanks a lot for bring up this subject, I didn't know about it at all
Happy New Year to all quilters and sewers
Francoise