Middle screw kept flying off with every spin! Flimsy wheel

After days, the screw in the middle kept flying off!! My kids were very sad that this didn’t work well. They would spin the wheel maybe 6 times per day and they spun it gently too. I would have to put the screw back on EVERYTIME my kids spun the wheel. I even made sure the screw was on tightly each time. Well, the last time we spun it on day 4, the screw flew off somewhere and we can’t find it anymore. This expensive $44 wheel (with tax) is now useless to us, after 4 days of use! Maybe I should have gotten the 18” size for better sturdiness? Or bought from a different company? I really wanted for this to work. The wheel was part of a reward system I set up for my kids to earn prizes when they did chores or something good.

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