Leica 135mm Tele Elmar disassembly?

[goamules]

Hi, I picked up a nice Leica IIIc with a 135mm Elmar in the kit. It's an early black one, with a little tripod. But it has some fingerprints on the inside. Someone obviously figured out how to disassemble it once, but I can't figure it out now!

Can someone tell me how I can get to the inner surfaces to clean it?

Thanks,

 

[presspass]

The lens head itself unscrews from the focusing tube so it can be used with a Visoflex, etc. If the fingerprints are inside those elements, it may need professional help.