To service a cup-and-cone rear hub which had been poorly serviced and needed new bearings in one side, the grease changed and then adjusted? I've just had to do this with a used set of wheels I've bought and though it's no biggy and the races are luckily OK I'm a bit annoyed at the seller's "Very good condition" so I'm going to chase a part refund off him 😉 Don't think he can reasonably claim ignorance, the entire axle was loose in the wheel. I don't want an inflated cost or anything, just a fair price to balance off the inconvenience and time it's cost me and the trivial cost of the bearings.