I was trying to fix this lens (for the Retina Reflex or IIIS) when the blades went out of their place - there are two types of blades(!) one is long and the other one is shorter (5 blades of each type) and I don't know how to reassemble them
I have notes on the Voigtlander (Bessamatic) Skopar, which may be similar ... it's in the same mount and has a double set of blades like that. Email me at [email protected] and I'll send you the sketches.