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I just saw this. Looks like too late.
I replaced a tab from a 50mm Elcan.
You don't unscrew it from the front, but remove a retaining ring from the back and the whole lens head comes off. Then you have access to the screw that holds the tab.
But often, every lens is slightly different. I really need to have it in my hands to see how to take it apart.
....Vick
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