When you google for information on this machine, leave off the 158. and just use the first four numbers after the period, 1703. According to the youtube videos by niftythriftygirl, this machine has a powerful 1.2 amp motor and plenty of cams. In a discussion of this model on sewing pattern review, one owner says she had had this machine for many years and loves this machine, it will sew just about anything but knits, even though she tried changing needles, changing thread, etc. Are you using the same thread in both bobbin and on top? The thread in your bottom stitches looks shiny, but the red thread in the top stitching does not. Your sample is flannel. What does it look like when you stitch on two layers of cotton, or of layers of a heavier fabric.