I have an ULT 2003D and have done this many times before. I have a quilt block that I'm embroidering with a stippling design and I've had a great deal of trouble with the hoop popping off in the middle of embroidering and damaging the design. Then I have to remove the stitches and start over. This is a thick item to hoop with batting and 2 layers of fabric. I added 220 grit self adhesive sandpaper inside the hoop which seemed to help somewhat but it still seems that I cannot get the hoop tight on the fabric and it has popped off again.

Any suggestions?