Zeiss Contessa shutter leaf problem-HELP !

[clicker]

Just bought a Zeiss Contessa that is in quite nice condition, however there is one problem. The shutter leafs are stopped down and frozen.I think I can fix the problem however I don't know how to access them.I'm not sure how to remove the front element. Are there small set screws or does it simply unscrew.Any help would be appreciated.
Thanks,
Clicker

 

[steamer]

If you need to ask you might not want to do this. I made a mess of mine and then sent it to a camera repair guy in the US who stole it! If you forge ahead you need to remember to mark the spot where the lens screwed off and mark the range finder gears and don't drop the range finder gears when you take the thing apart etc.