Finally, it's difficult to get the case back on because the rewind button can't be pressed in any more. To solve this, I just hacked the top off the button as it's no longer required anyway. Putting the case back together is still a bit fiddly, but once it is on, replace the screws and put the rewind lever back into place.
Now you should be able to load, wind and shoot your viv as before. When the film is finished, push a cocktail stick into the small hole, and lever slightly until the lock is released and the rewind wheel can be turned in the "wrong" direction. It's a good idea to practice this before you load up! Hold the stick in this position while rewinding the film.
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