Insert the tips of a tweezer into the two holes in the "button" on the front cover and turn until the flat side faces the center of the shutter. Rotate the cover counter-clockwise until the tabs match the cutouts in the lens opening. Insert a small screwdriver into the cutout for the "button" and gently pry the cover off.

Lift the speed setting ring off the shutter. Note the position of the pins that are fitted into the slots in the speed setting ring. On reassembly, these pins need to sit in their respective slots.

Note: Once the speed setting ring is off, you should not attempt to wind the shutter. The center cocking ring will pop up if the shutter is wound or triggered with the cover off.

Note the position of the cocking ring in relationship to the levers on the slow speed assembly, latch, B lever, and booster spring. All of these points interact with tabs on the cocking ring and control the operation of the shutter. On reassembly, you need to insure each of the tabs on the cocking ring is back in place.

To remove the cocking ring, unhook the spring attached to the end of the slow speed assembly, lift up and rotate the ring clockwise until the spring is clear.

Remove the shutter trigger. Lift the release lever and high speed spring together. The release lever has a spring underneath it that sits in a groove in the case.

Remove the screw in the flash contact and lift the contact out.

Note the position of the spring on the latch, then remove the screw and lift the lever out. Do the same for the B lever.

Unhook, but don't remove, the spring on the blade operating lever. Remove the screw in the lever and lift the lever out.

Note the slot at the pallet end of the slow speed assembly. The distance of the assembly from the lens opening controls the position of the pallet and thus determines the speed of the shutter. Before removing the slow speed assembly, make a mark around each end. The slow speed assembly is removed by removing the screws at each end and then lifting the assembly out. Note: you may want to leave the slow speed assembly in place. Adjusting its position in order to set the proper speed can be very difficult.

Turn the shutter over and remove the screws holding the shutter halves together. Lift the back off of the inner base. Try to separate the two halves without disturbing the shutter blades. Note the orientation of the blades, the direction they overlap, and which blade is placed on last. During reassembly make sure the blades are replaced in the proper order. Lift the blades off the base. Don't touch the blades with your fingers during removal or replacement.

Examine the blades closely. On some shutters, you will see one of the blades has its tip slightly bent. This blade will either be the first or last blade put on depending on how the tip is bent.

The outer base holds the diaphragm. Normally, you should try to flush clean the diaphragm without removing the blades as the diaphragm can be very difficult to reassemble. If there is old grease under the operating lever, turn the lever until you see the two screws holding the lever to the base through the holes in the diaphragm cover. Remove the two screws and the operating lever will fall off.

The blade activating ring is held to the inner base with three screws. Remove these screws and lift off the cover and ring.