Leica R4 Top Cover Removal?

[tonal1]

Hello,

Is there a secret code or magical incantation required to get the top plate off a Leica R4? Anyone worked on one of these before?

Thanks

 

[monopix]

Look here

http://books.google.co.uk/books?id=...ult&ct=result&redir_esc=y#v=onepage&q&f=false

and click on the R4 section in the contents list. It'll tell you all you need to know.