Removing Industar-61 L/D Optical Block

[nation_of_pomation]

Does anyone know how to remove the optical block from an I-61 L/D? I did it once with a zebra non-L/D version once essentially on accident, but now I have one that I need to look at to see if it has fungus in it. I think I see a little mixed with with some specks of dirt/dust, but I'm unsure. I may want to let the lens go along with the way, way off FED-5C Olympic Edition it came on, but I'm worried no one in their right mind would pay any money for a camera and lens that needed to be CLA'd.

 

[gb hill]

This should help.
www.pentax-manuals.com/repairs/i6ldservice.pdf

 

[nation_of_pomation]

So is there not a way to just pop the block out? I remember removing the rear light baffle and then it unscrewing. Doing it just now made the aperture mark not line up with the click stops.

 

[wolves3012]

If memory serves me correctly (and it might not!), remove that rear baffle and behind it is a retaining ring. Undo it and the block falls out the front. Or, hold it still and unscrew the block. Watch out for the shim(s).