Unfortunately that's a pretty common issue as the Chinese metal's are very soft, I've seen them much worse than that so what I do is grind down the flat and build it up with weld and reshape the replace the bucking bar with drill blank, the bearing can get pretty deformed as well over time so a 8mm ball bearing replaces it then they all last quite awhile, too much tension contributes to this wear so it's best to have just a little slack/endplay so that everything can move and turn freely not wearing on each other.