Unhook and remove the springs on the blade activating lever (bottom right), shutter relase and B lever (top). Remove the main spring as well. These levers are permanently attached to the shutter base and can't be removed.
Remove the two screws in the speed/aperture plate and remove the plate.
The drive ring will not come out with the knob still in place. Unfortunately, this knob is attached with a rivet. You can punch out the rivet if you have the ability to re-attach the knob some way. The technique I use is to leave the knob in place and work around the ring. Remove the two brackets on the drive ring and then remove the two screws in the shutter base. As you lift the shutter base up, tilt the drive ring and slide the base out.
The shutter blades are attached to the base with rivets and cannot be removed. To clean the blades, submerse the entire base in solvent and blow or wipe dry.
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