installing aperture blades. front element orienation?

[eddie gunks]

hello all,
i have a 105 rodenstock omegaron enlarging lens. i took it apart to clean out some fungus and as you may have guessed i dropped out the aperture blades. i can not figure out how to get them back in correctly. anyone know of, or have a photo of the aperture blades installed correctly so i can see how they go in? this would be a great help.
also i am only half sure which way the front element goes in. does the convex part face out or in?
thanks for any and all help. next time i promise to take a bit more care when i get into deeper water. trying to fix my lens during my printing session was not the best idea......

eddie

 

[Konical]

Good Afternoon, Eddie,

I can't help with the aperture. Every enlarging lens I've ever seen has a convex-surface front element.

Konical