proto shutter problem

Hi all

I have a problem with my pronto shutter from my hapo 66E

For some reason I can not remove the front lens enterly, only the first part, the 2nd part is completely stuck and I can not find any screw that holds it in place.

I then placed the shutter in "wasbenzine"(gasoline) to clean it and afterwards everything runs smoothly (the timer wasn't working and low speeds sticky)
But the only thing I can't solve is the fact that the shutter blades open a bit when cocking the shutter (I have cleaned the shutter blades seperately)

anyone a solution for that?

Pronto shutter ofcourse

If you had disassembled it and put it back together I would say it is due to wear but being you only flushed it its still dirty inside.
Search engine Prontor service manual , you may find one that closely matches yours to use as a guide.

Thanks, I found the manual, I had been looking for repair manual

One problem remains. I can't get the front lens of completely. Only the front part of the two ellements.
The other part is firmly stuck in the shutter

I suspect there is a screw I can not find, anyone any idea's?