I made a sterling ring from a wax carving that I created last year, and somehow my finger shrunk and now it is too loose. I like that ring a lot and would like to cast it again in a slightly smaller size if that is possible. I have a rubber mold for it as well as a few wax copies. I guess enlarging the size would be easy by simply filing away a bit from the wax molds, but making it tighter? I am a bit stuck Any ideas?