I just bought a Sapphire, the one below the embroidery machine. I noticed that the uplist bar has a small black attachment. It keeps the thread from jumping out. I am going to take my Diamond in and see if they can put the black gadget on it. I have to do lots of ripping with my embroidery machine because the thread jumps off and you have this gob underneath.
I wanted the Sapphire because it has a scissor cutter and when I am quilting in the middle of the quilt I can cut the thread and change stitches or go to a different part of the block I am working on.