How do you get the bell clapper on the bell in poptropica?

You first go to the science lab and make a stink bomb. Then you go and collect pieces of the comic. Get the gum and go in the school. Chew the gum. The teacher will get on to you and you'll have to sit in detention. Then set off the stink bomb. The teacher will go out and you walk to the cabinet. Click on the last 2 doors and there will be a ladder. Click "down" and then go and turn on the light. Go to the very top. if you see a cylinder-like stick attached to a sphere, that's the bell clapper.