for about two weeks now, I've heard a ratteling sound in the wheel(front wheel), I took it to the bike shop and they couldn't figgure it out, untill i found out it was in the Hub. It turns out that it was a bearing loose, whilst having a look at the bearing, all the other bearings started to come out from their place. Any ideas on what I should do? take it back to the shop to make them put it back in? I'm finding it hard to make them stay in place, there's about 6 of them out. Another qustion, i want to take the cogs off, to give them a good clean, I'm not too sure how to take them out so any heap with that would be awesome!