I will be addressing this gear at some point in the coming weeks. I have started ordering parts and thinking about the rebuild. So far I've fitted a solid tool post to remove the compound in order to work on it.
Eventually I will pull the suspect gear and rebore it.
So far, I like the idea of boring out an exact gear sized bore and pressing the gear into it but like the idea of a sabot. I don't think I'll need a huge amount of holding power, just enough to turn out the old brass bushing and retrue the bore.