You can put some vegetable oil or crisco on the axle. It'll make parts of his back rather greasy though as he rubs against it while he's running, but it does go away in time. To help it go away, you could put a tiny chinchilla bath in his cage for a night every couple of nights or whatever. It'll help with the whole greasy thing.
If that doesn't work you could get something called a 'silent spinner', which is a different wheel. I have silent spinners for my little hamster boys and they are awesome. I don't know if they're available where you are though.
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