I'm very much a newbie, so please forgive my ignorance. I want to replace the broken Snack Bar plastic on my Creech (the "I" in Film piece is snapped off so the ball sometimes gets caught behind the scoop). I have the new plastic, but can't figure out how to remove the red dome from the old plastic (it looks permanently affixed) so I can put it on the new one. Is there an easy solution?