Hotpoint WM63?

Hi....
I wonder if you can help, please.
My Hotpoint WM63 washing machine was running and threw its drive belt.
I put the belt back on, started it up to test it, it worked fine, however the drum is bouncing about like crazy (that is obviously why the belt came off). I can hold the drum still from buncing around and wondered if someone could tell me what I could do. I can see two large springs on the top, they work fine.... are there anymore...