I have a XT Shadow Derailer installed. I have been trying to diagnose ruff shifting issues forever. I pulled the upper pulley (the one closest to the cogs) and notice that there is a significant amount of side to side play. This didn't seem normal to me considering one of the steps to tuning is making sure that it lines up with the large and small cog. Its kinda hard to do this when the pulley is moving side to side. So should it be tight or is play normal?