My personal preference , unless the razor has plain Jane generic scales, is to leave them original unless function is compromised. A crack at the pivot can be a problem if it loosens up when stropping or honing, if not when shaving. With fancy scales such as those on a Deutsch I would opt to leave them as long as the blade doesn't begin to loosen up in the pivot. That is as long as the cosmetic aspect doesn't bother you. Just IMHO.