don't think it's arthritis that useally affects the joints, its more the thumb print.
didn't know zippo done butane, i think the mrs got me a lighter yesterday for xmas, if she got me a zippo it would have been the classic but i gave her a chioce of a zippo or a dunhill lighter, she might have got me the dunhill as they are alot more expensive, hope so just have to wait for tommorrow. happy xmas mate have a good one.