Fixed the same problem just now on my Zanussi TDS 383W, and it sounds the same drum type of design as you have.
Before I got around to fixing it,We had the problem for years with my wife complaining of ripped clothing, or clothing with dark marks on it, from things getting caught in the gap between the drum and the seal at the front of the machine.
Anyhow, how to fix it:
1. Remove the top by taking out the two screws at the back.
You will what has happened is the drum has slipped off a big circular seal between it and the front of the machine. If you pull up on the back of the drum and push it forward, it will then mount the seal. That is where it should be. The trick is to keep it there. Do that as follows:
2. Remove the drum bearing by taking the screws out on the plate that is exposed in the middle of the metal cover at the back of the machine, and removing the circlip.
3. Find 1/4inch of thick washers just larger than the shaft and put them onto the shaft. This acts as a spacer preventing the drum moving into the bearing.
4. Put back the bearing, putting in some high temperature grease to keep it going.
5. Switch it on and check it works.
6. Put the lid back on.
7. Do not tell your wife how easy it is.
Alex, September 2006