has anyone ever tried the plastic flying saucer http://www.petsmart.com/product/index.jsp?productId=3155602. I will replace it with the "real metal one" once i have the time to go down to portland. my chinchilla is not a big chewer and i've read that even when they do bite it, the hard plastic doesn't break. would it be okay if i left it with my chin permanantly in his cage?