While we are on the subject of aching backs from quilting. A few weeks ago I was in one of those "dollar stores" and by the cashier there was a wire mesh sort of contraption that can be put in a chair to lean back against. The gal said she had one in every computer chair she uses. I bought one to put on the sofa while I'm quilting and it is WONDERFUL! Lots better than a pillow. I move it to my sewing chair, too, but I usually am not leaning back when at the machine.