I left my Jo (white oak, 1 inch diameter, 51.5 inch length) leaning in the corner for two years. Now I'm using it again and it is noticably bowed and deformed. While it is straight "enough" to be functional, I don't like it.

Some people have told me if I suspend it between two points and put a weight on it it could in time (weeks) bend it back. Other people have told me they haven't been successful with that method.

Is there any to repair the weapon and make it straight again?