My rear axle snapped last week . I got a new axle which is the same size and type as the old one etc.. Last night I fitted the new axle, I greased it and then put on the cones and spacers. Everything seemed fine, I put the wheel back on the bike, tightened the skewers. It seemed perfect, there was no side to side movement from the wheel, it was tight. Then I cycled the bike about 500m and I could feel the wheel starting to move from side to side! Whats wrong? And how can I fix this?