Here's the shutter control area with removed controls. Remember, the screw nearest to the cocking wheel is not necessary to remove.

Remove the two screws at the bottom of the shutter. The complete unit should come off now easily. In my case, it didn't, because one of the top screws of the slow speed escapement was loose and blocking slightly. A thin screwdriver helped to press it against the rest of the shutter while removing the unit.