Originally Posted by
Rodney
... You mentioned the attachment moves the yarn side to side so the thread actually goes over the top around the yarn instead of through it. Very neat attachment. Rodney
Yes, if you can watch the video it shows the process pretty well.
If you wanted a stitch through the yarn, you would use a cording foot.
This was designed to primarily use Chenille spools (still looking for them now) and if the top thread was color matched to the chenille it would be mostly invisible.