too heavy for hamster to run in!

We've been using this wheel for a few months now. We have a teddy bear hamster that outgrew the smaller wheel that came with her cage. The first one of these we had to return because the wheel was cracked when it was delivered. The replacement works okay. It's just thick, heavy material so she doesn't use it as much because there's so much resistance to make it go. I have adjusted the yellow knob. No improvement. It's just a heavy wheel.

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