My daughter received a rock tumbler for Christmas. we set it up 2 days ago. The wheel inside the base turns,but every now and then the barrel stops spinning around. We are wondering what is causing this to happen. We weighed out exactly 4 oz of rocks, did exactly what the instructions said to do, but every now and then I have to open the lid, and turn the rubber band around on the barrel in order for it to keep spinning. Did we get a defective tumbler?
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