No problem, Unfortunately I don't have an assembly diagram but it looks like it would be reasonably easy to reassemble as long as all the bits are there. I had never even seen one until a couple of years ago until I bought the one I have advertised on ebay UK. If you decide to get the one off me you could pull it apart and see how it all fits together. My guess is the one you have has wear in the discs and probably slips there. That small amount of wear on the casing shell wouldn't give a drive problem in my opinion.

