I would have expected it to sew stitch #9 with the dual feed. I'm sure I have in the past. I have used the blanket stitches with mine so that wouldn't really be any different. I hope you get it sorted. If I'm unsure if I'm going to break a needle I always turn the wheel by hand to make sure I'm not going to hit anything. The dual feed should be fine though as it's built for the 7mm stitches