You probably have something that slipped through the holes of the drum and lodged itself into the tank. When the drum spins, it can stick out again and damage your laundry. With patience and luck and twisting the machine up and down (I know it is heavy!), you can get the "thing" to stick out again through a hole and grab it with pliers to pull it through. You can also try to access the space between drum and tank by sliding and wire hook from the front (where the window rubber seal is) and "play" with it to pull the unwanted piece out. The last resort is dismantling the whole machine to take off the drum. This is not really difficult for someone mechanically minded and methodical. It takes a lot of time and thus would be expensive if done by a professionnal.
Good luck.
Stephan, May 2008