I bought the flying saucer wheel because it was easier to purchase than the bucket wheel. She got heavy and started tipping the flying saucer so I purchased a bucket wheel. She refused to run on it, and I tried for quite some time because I didn't know what else to do. One day I had an idea and filled the under side of it with the bigger aquarium rocks and siliconed it in place. It is incredibly heavy she can't move it at all so she will never get to the silicone. I am worried about her joints but I know if she doesn't run she will be depressed and over weight. If I were to do it again I wouldn't have used the flying saucer at all.