I have a dial set Compur shutter that I am trying to clean but can't get the front cover off. (I have removed everything, the attached picture is before I started.)
The large silver lens mount tapers toward the bottom so there is no way to remove the front shutter plate without removing it first.

Is there a secret to removing the lens mount ring?

Picture attached.

P1140672 by rrunnertexas, on Flickr