Do you have your machine tilted towards you? I found putting two rubber wedge door stops under the back of my machine has worked wonders with the strain and pain between my shoulders and my neck. My husband looked at my sewing posture while I was at the machine and asked me why I was leaning my head down to see the needle area of the machine....he said, your neck must hurt by the end of the day....he was right....my neck and between my shoulder blades. I saw one of those Plexiglas machine supports, but way too expensive....so I tried the door stops, works great.