I'm binge-watching Antiques Roadshow and after many hours of marvelling at things like Tiffany glass lampshades, a 5-carat rose-cut diamond ring, a first edition of Anne of Green Gables, and a painting by Diego Rivera that had disappeared c.1930, I've finally seen an item I must have. These were used to power small machines like butter churns or laundry. I don't have anything like that, but my dog has so much energy I've got to be able to harness it somehow, right? I wonder if I could hook one of these up to a mobile or baby bouncer or something and keep two of my needy creatures occupied at the same time?