Picklers -- kitchen appliance question here. I have a Rival Seal-a-Meal food saver, about three years old, not heavily used. The only way I can get it to seal is to take out and replace the gasket about every other bag. This is tiresome. Googling does not reveal a source for replacement gaskets, my first instinct. Is there some trick I'm missing, or does anyone know of a source for replacement gaskets?