Remove the old mount. To do this, press the lock of the mount with the tip of the screwdriver (picture 1).
Turn the ring until all 3 screws are visible. Remove the 3 screws (Picture 2).
Step2: Remove the rear element. For this you need a lens removal tool. If you don’t have a lens removal tool, you can use a caliper tool. The rear element has two notches to fit the tool (picture 3a and 3b). Put the tips of the caliper in the notches and turn counter clockwise while pressing down. Keep turning counter clockwise until the rear element is loose. Remove the element and put aside.
Step 3: pull the old mount out. If it feels like it is a little stuck, rock it back and forth gently.
Step 4: Put the rear element back in place.
Step 5: Remove the aperture lever and save the 2 screws as they are reused (picture 4).
Step 6: Remove the pin (picture 5).
Step 7: assemble the new aperture control (EdLink and EdBushing) as shown in picture 6.
Step 8: Slide the EdLink into the aperture control (picture 7) and fasten the new aperture control with the screws from step 5 (picture 8).
Step 9: Put the new EdMount on and fasten it with the new screws. (picture 9).
Step 10: Enjoy your EdMika’d Canon FD lens on your EOS camera.