Good suggestions, ladies. Thank you. I tried the blue painters tape to fasten down the entire attachment, thinking if it was tighter against the bed of the machine maybe it wouldn't move, but then the fabric drug on the tape. I will try just taping the part where you choose the size and see if that will work. Also, I was sewing through a quilt sandwich (which didn't seem to be a problem) but there wasn't any stabilizer in it.