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Yvar 75mm; frozen focus ring.

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Three screws around the perimeter can be removed to access the frozen focus mechanism. If I plan on re-assembling in the exact same way, I remove the screws all the way, so the indentations can be seen to aid re-assemble. 

In this case, I will rotate the lens when I re-assemble it, so the index marks are in the correct place for the H8. 



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The focus mechanism came apart with exactly two turns. It was not that bad, but it was cleaned and re-greased.

This one appeared to be simple threads with a single start location, not really a helicoid. 



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