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Any method or tool is hard on your hands after a lot of work, our bodies were just not designed to do that kind of repetitive work day in and day out. By all means get whatever interface/mouse/tablet seems good to you, but don't stop taking breaks every few hours if you want to keep doing this work for many more years. I often ice my right (trackball) hand during the day as well to get the swelling to go down, this seems to help a lot. With a trackball like Kensington, it's important to make sure that your hand/wrist and forearm are lined up with each other in your normal working position.
Philip Perkins
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