calibrating the aperture assembly on a canon 24-105 F4L
i replaced the aperture flex cable of my canon 24-105 which was badly torn and causes err01 when i try to use my lens. but i was not able to make a careful mark on the 3 eccentric setscrews that is used for the alignment of the 3rd group optics in the aperture assembly. now i am able to use my lens but all images captured are not that sharp as before and compared to my other lenses i can really say that my 24-105 is bad and out of calibration. i need a guide to calibrate the 3 eccentric setscrews... i found some guide somewhere but it is not clear how.. i need in layman's term if possible with illustrations
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