After many years and miles my rear hub has developed a very small amount of play in all directions. I wasn't able to remove the play by tightening the nuts either side of the hub (not sure what you call those nuts? I might need to replace them as I slightly rounded one out trying to tighten it).
I'm inclined to fit a new pair of £1 cartridge bearings and then cross my fingers for another decade of maintenance free rolling. Is that the case, or do hubs wear out in other ways, are the new bearings likely to fit ok? The spokes have worn some grooves around the holes in the flanges but other than that, the hub looks as good as new.