how do you get to the blades in a prontor-s shutter?

jnanian said:

hi there

i bought a balda camera a little bit ago to replace my now dead mamiya 6.
the shutter needs a cla, but my repair guy wasn't able to get behind the second layer of glass in the lens.

does anyone have experience getting to the inside of the shutter in this lens ?

does the shutter need to be removed from the standard, and the blades gotten to THAT way? what we were able to do was remove the infinity stop and unscrew the front element out, but after that we were stumped ...

any information would be helpful!

thanks in advance!
john

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