I have one more suggestion -- if somebody else touched on it, I missed it. I am a beginning P.P. and I have managed to cut a piece too small more than once. If it's too much trouble to take it out (or I'm in a hurry, which is usually the case, I have been known to sew on a little scrap to make it the right size. It is hardly noticeable in the grand scheme of things and I belong to the "whatever works" train of thought.