loosen your top tension just a tad, make sure you are using the correct size needle & use a spool 'net' if needed- or place in a cup or holder of some sort & place behind the machine-instead of using on your spool pin. check the charities carefully- invisible thread is generally not recommended/accepted by many charities- those quilts tend to go through commercial laundries- hot water, harsh detergent, invisible threads do not hold up. monofilament (polyester) is always recommended over nylon which stretches, becomes brittle and breaks/disintegrates after a few washes.