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MC Rokkor-PF 58mm F1.4 lens
Here is a better look at the oil on the aperture blades
Remove the four screws holding in the aperture assembly
Loose or remove the three set screws around the aperture assembly barrel
The beveled side faces the front of the lens
Don't forget to clean the inside of the small holes for the aperture blade pegs
Carefully adjust the aperture blade position so that Hae pegs align with the holes in the lid
The aperture assembly needs to be slightly rotated
The rear element is cleaned and already installed
Check functionality one last time