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This is the Leitz Summicron 50mm ROM model.
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Here you can see the ROM contacts.
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First, unscrew the black shroud screws.
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And use the plastic tool to lift it.
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Now we can take it with the fingers.

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But the aperture lever nose doesn't allow to remove it.

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Let's unscrew the bayonet meanwhile..
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Now remove the bayonet.
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Look for the small ball and save it for now.
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Finally I realized that focusing to the shorter distance we can liberate the shroud..
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Now I replace the small bearing ball, and add some grease on it.
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And now we can install the Leitax bayonet, the red dot in front the scale center for Pentax, and slightly to the right for Nikon.


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