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How to disassemble Leitz Summitar aperture ring

Early! nickel elmar 13.5 f=50mm 11 o'clock pin release lens leitz wetzlar 1932 pre-100k serial number on rim (95885) nickel elmar. Glasses are free from scratches, show light cleaning marks and some scuffs to glass surface. So is the Yellow 1 early filter with exchangeable glass!