Posting this in the Brian Sweeney forum because Brian contributed to the Zeiss-Ikon forum a lot and has some pictorials up there on how to disassemble sonnars.
Received this message two hours ago:
I regret to announce that I am closing the Zeiss User Forum at www.ziforums.com due to inactivity and expense. Thanks to those who contributed and participated.
I apologize for the mass email, and you will not receive another email regarding the Ziforums. I just wanted to give everyone a chance to download any content (images, text) they want to keep. I'll leave the site up for another week.
So, should you want to get save pictorials on fixing a Sonnar into Leica specs, this is the time. Not sure whether new members can still register, but I'm going to download those pictorials myself so you can ask me. I won't put them up online, since they aren't mine to share.