Check the heigth of the stand against the others for distance to the center of the shaft opening. IMO you have some small stress going on there and in the photos it appears that the shaft has a visable wear ridge. It is extremely difficult to determine from a photo but but I'd think of an alignment problem. Also is it normal for the oil hole to be larger on one side than the other as indicated (again) by the photo. Is it being lubed correctly?
