The lever is adjusted at the plastic holder, and secured by a drop of melted plastic (here removed already, just scratching it).
Now, remove the aperture ring from the lens to work on it.
After scratching out the melted drop of plastic, carefully move the metallic lever until it can be lifted.
And we can replace the aperture ring at the lens without the lever.
(If you have to rebuild the Contax lens later, just pour a drop of epoxy glue over the lever where the plastic drop was.)
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