I see it looks like you have a Pfaff Grandquilter per IceBlossum....Anyway...If you go to the Pfaff.com website....click on "Support and updates", enter in your machine where it asks what machine you have, you should see a pdf of the manual for the machine come up......On my bernina knee lifter, it does wiggle it way out when I am stitching, and I just have to push it gentle back in every once and a while.