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Some hams learn that bar chewing gets them attention so the best thing to do while it's happening is to ignore it completely & only pay attention & get your ham out when it stops.
It sounds like your ham may just want out more out of cage time if you can manage that it may help.
Whimzees are the best chews, they love them so great for distracting them!
Do you have a photo of your cage set up so we can see if there's anything else that might help.