Pentacon electric 135mm 2.8 problem

[D1N0]

I've taken the back of a pentacon electric 135mm 2.8 in order to clean the rear element from some residue on the inside. Somehow I can't put it back together again with the aperture still closing. The lever that controls the auto aperture pin won't depress enough to push the pin out and when assemble the a/m switch won't budge. What am I doing wrong?


#1 back end with lever


#2 rear of lens without back end

[Lloydy]

[D1N0]

I found an image of how it is supposed to look


source: https://www.instazu.com/media/2105186620201624566