Cistern glitch

[Nothinglikesleep]

played through the game again and once again the eastern bridge will not come down. Cannot proceed passed this point

Here's what i do:
I enter the water works room, bring down the ladder, then I proceed to the western bridge and turn the 3 cranks. I then go and do the weights puzzle, turning them until they click and then I can't turn them anymore. I then pull the first and last lever, put the three pipes in place, hear the baron's voice and then when I pull down the lever for the eastern bridge nothing happens.