I am having a custom engagement ring made as we speak, the problem is my girlfriend''s ring finger is skinnier than her knuckle. She needs a 4.5 size to get the ring over her knuckle, but once it is on, her finger is closer to a 4 or 4.25 size. Is there anything that can be used to fix this? I have heard of a butterfly contraption, but everyone that I asked said those don''t work. I need some kind of solution to help keep the ring from spinning around.