In the Chamber of Secrets for game boy advanced I am in the restricted library and I can't get past that door that leads to the potion book to change into Crabb. I can't find anything to put on that silver thing to keep the door open so I can get the book. I need help trying to find a heavy object to put on the silver platform. .....................................................................................................................................................................................How do I get past the prefects?????????????????????...............................................................................................How do I get the Nimbus 3000 broom??????????????