I have a lot of knowledge about AF and MF Nikkor, Cannon Olympus and Voigtlanders SLR and Leica mount lenses, most parts of the design and build is same same :-) but this tiny Leica has some differences as to how it's put together. First I was very disappointed to find that the front threads part series 5.5 threads is glued to the aperture housing, next I found that the rings that 'normally' have two holes or ridges for lens spanners for tightening the old Leitz lens had one or even none, so had to be taken apart with friction, a rubber tube of the right thickness must be used to reach into some parts of the lens to get it apart, I modified these rings, drilling two holes makes the hole deal a lot easier.
Got it all dismantled and sorted out, the two elements with the Canada Balsam issue got a 'cooking' treatment in boiling water to separate the two halves.
A drop of Araldite Krystal and the two are inseparable, a coat of mat black paint to finish the job off.
Putting everything back together without leaving dust or prints is the worst part... The old gease was cleaned off and the many threaded focus threads lubed with new grease and put back together as marked by disassembly. The new focus tap needed a slight trim to clear the mounting ring and two extra location holes to keep it in alignment a single screw holds it in place. Everything fits within very tight tolerances; position of glass elements, focus threads so it was a joy to work on it.
All the parts, note extra holes, the two glass element front center
Extra holes for focus tap in focus mount.
Focus mount with focus tap.
24 hours wait for the Epoxy to cure and testing today went very well, focus at infinity and all the way to 0.7m is spot on.
Lens is now in good service condition and much closer to my heart
Edited by Dallas, 09 October 2012 - 15:00 .
spit & polish