Recently I purchased late German ver4 summicron 35 2 in really nice condition overall except for one small issue, looks like it's aperture ring needs cleaning, it becomes sticky, especially if I do not use it for a few days then it is difficult to move for the first time so I have to make effort to budge it. Not a big deal for now but I'm afraid that with time it may cause more serious problems since the 4th one is known as not the sturdiest from 35mm summicrons.
So I was thinking about cleaning the ring out.
I was searching for disassembly instructions and found several great videos on youtube from a user called mikeno62. Unfortunately, there are videos for ver2 and asph summicrons and the 4th gen looks different since it does not have that ring which holds other crons together. It's back part looks exactly as the one on summilux 35 pre-asph in another mikeno62's video, but I afraid to break the lens without exact instructions.
Does anyone have information about how to disassemble the 4th summicron? I'm not planning to go deep inside, just take off the focusing mechanism and take a look on what may cause issues with the aperture ring.
PS: Sorry for my poor English