Hand excercises

My day job is mostly my dominant hand clutching and making fine repetitive movements with the fingertips, and my non-dominant hand pushing and stretching. Sometimes the tension and arthritis gets to be so much that I can barely move my hands at all. When it gets to this locked up point, only repetitive, vigorous work of almost any other type is about all that helps so I can go back to work again in the morning. Tonight it's filing and polishing a paperweight.