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@Momentum
Sounds like you need new bearings. It's easy enough to replace them:
Take off one of the end caps by grabbing them both and pulling - one will come off and the other might too. Don't use tools which would mark or damage them as they're not amazingly burly. You should be able to do it with your hands if your a real man.
Then support the hub shell on the side with no end cap. Use something solid, with a hole big enough for the bearing to come out and which adequately supports the hub shell. Hit the other end of the axle with a rubber mallet or a hammer and block of wood. The bearing will come out with the axle. Get it off the axle and then turn the wheel over and use the axle to get the other bearing out which has been left in the hub. You could use boling water if you want - I don't and have never had a problem.
Get your new bearings (ask BETD or look at the ones you've taken out for an identifying number). Lightly grease the outside and tap one into the hub shell using the old bearing or a socket which is the same size as the outer "race". Do not hammer the inner "race" or the black bit inbetween the two (the seal) as you'll fuck your new bearing. Then flip the wheel, grease the axle and put it through the bearing in the hub. Grease both inner and outer parts of the new bearing lightly and tap it into the hub over the axle with a socket as above. All of this "tapping" may have to be reasonably hard to properly seat the bearings - there should be no side to side play in the axle.
Clean up all the grease and slide on the dustcaps. Well done - you've got new bearings.