Originally Posted by Sadiemae
I think it is difficult to center it perfectly, but people do it.
You have to really play with your tension to avoid dots.
I think this answer hits the nail on the head- it's the uneven tension that pulls one thread to show on the other side (that is true of any sewing machine), and you would have to play with adjusting it top or bottom (or both) to get it just perfect. You might want to settle with dots on the back rather than the front if you can't get it centered.