The 8.5cm F2 Sonnar- the barrel "should" just unscrew, using a rubber pad. The rear group unscrews from the barrel once it is out. Getting the glass out should not be hard, unless someone has botched a prior "repair".
Yes, what Brian said.
Unless there's a grub screw in the back or it's frozen with old grease it should be reasonable to get out. You may even be able to do it with your naked hands. I posted this thread because it's an exceptional (read: not normal) horror story. Usually servicing these lenses is quite undramatic.
I tried this once- the answer was no, the shape of the back of the barrel was changed and it would not fit. ALSO- the J-9 focus is too far off for a Leica standard camera. The best option is to use an Amedeo adapter with the Contax mount lens. That is what I do.
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