Someone mentioned glue basting. In my experience, glue basting *does not work* on poly batting. Pin basting is probably your best bet. Because I do a lot of free motion quilting, I pin baste in rows about 4 inches apart and then load the machine with a water-soluble thread. Baste with that between the rows of pins and then they can be removed. No need then to worry about accidentally hitting a pin and damaging the machine.