Bought a 1950 KMZ J-3, advertised as way off and fit for use on a mirrorless camera. It was off my 2m at 5m, and the optical fixture was glued into place. 6 hours in acetone. Popped all the glass out of it.

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The serial number on the rear fixture shows it to be from a 1943 Zeiss lens. The Tap shows that it was originally finished in Contax mount.

The focus mount is from a ZOMZ J-3, has three setscrews for holding the helical into the mount.

There were a total of Five (!) taps for the guide pins. I'm glass I scribed the correct set before taking out the guide pins.
This was a long-job, 6 hours in acetone and a lot of cleaning loosened paint and glue out of the helical.

Added a 0.48mm Shim and moved the rear module in slightly.
It was worth it, one of the sharpest J-3/Sonnars that I have ever used.
