Solving stuck aperture blades on the C.Z. 135mm 3.5 SONNAR M42

This was an impulse video at 4am after I fixed my Sonnar's stuck blades. I apologise for the length of this video but if it helps solve your lens issue, then it'll be worth it. If your C. Z. 135's aperture ring turns back and forth but the aperture blades don't move then this video may help you. You do this entirely at your own risk and I shall not be responsible. If this is your first time attempting such a task then I recommend that you make notes and or take photo's as you go along. When you undo the 3 rear screws and commenced to lift off the rear lid, I suggest that you lift slowly and see how the flat rod and flipper separates from the lid.