Go to this Page it shows how you strip down to the clutch which from all the information I can find has to be completely replaced. I bought a set of belts for DC04 only to find this out. Also a bod on the net selling the information for (£9.99) that you will get free if you go here.
http://www.sparesaver.com/technical_advice/DC07_technical_advice/dc07_Clutch_Belt_Replacement.htm
I can't find a way of stripping down the clutch so will have to resort to buying the full assembly at about £17.99 + PP.
The hard part is locating the clips under the Yellow clutch cover but a bit of brute force with 2 small screwdrivers did the trick. Good Luck it has taken me Half Sunday afternoon while watch Lewis Hamilton come 2nd again Brill. Hope this helps
Robb
April 2007