So I tried a little DIY lens tinkering on a spare Focotar-1 today that would have needed cleaning anyways. Sweet fancy moses, I'm no slouch in fixing things. But that thing... I broke my spanner inserts during that operation. A heavy duty spanner, not the small ones. I could not open the inner ring, no matter what I tried. It must have been glued to the thread or something. The outer ring which holds the outer casing of the barrel was easy. This inner ring... impossible. I slipped once and now it looks ... ugly.
I can only imagine the -2 been similarly sealed and the reason Leica did not open it. The rings and threads would probably have been destroyed or at least scratched a fair bit. And they said they have no spare parts for Focotars anymore. Surely they would not send back a lens with broken threads, so the only option is doing what can be done without breaking it open and send it back...
Anyways, I've sent it out to Fototechnik Langer, see what he can do. In the end its probably best to look for a mint one in the first place.
Andi