I have heard Uberti has a good reputation for customer service. I would contact them about the problem, and ask for a return shipping label to return for replacement or repair. I own and shoot several BP revolvers, but I am not an expert. Gas cutting in a BP revolver is something I have never heard of. As far as the binding on the arbor, you might want to try using a non petroleum lube like bore butter on the arbor, as it seems to keep the fouling soft, and might prevent the binding. The gas cutting has me baffled, unless the arbor was made with un hardened, inferior steel, something Uberti is not known for.
Larry