Opening Pronto shutter

This shutter is from a unnamed rather rickety camera for larger rollfilm format than 120.

I'd like to be able to eventually service my Prontor SVSs and Synchro Compurs etc. successfully but should keep learning more in the other end first. I've removed this Pronto from the camera and would like to get into it. I tried to remove the 4 screws at the back of it but nothing was freed so I put the screws back.

Has anybody here experience with this shutter and can tell me how to go about it?

Please provide a side view of the case.

There is nothing on its sides except this .. what's the english name ..?

Take a good picture of the shutter front and rear with the lens cells removed to show the shutter blade pattern clearly, you will need them for reassembly.
Remove the mount flange.
Remove the 4 screws from the rear of the shutter.
Remove the shutter back by twisting and rocking it slightly while trying not to dislodge the shutter blades, they will fall off when the shutter is turned face up with the back off.
The back to case is a very snug fit.

Dial set Prontor/Prontor Press


Yours is a Dial set.

That is a cable release socket on the side of yours. The side view told me the back comes off as that's where the seam is.

Thank you!!

I'm not sure what "mount flange" is.

SalveSlog said:

I'm not sure what "mount flange" is.

Click to expand...

A mount flange is a piece of metal that has 3 or 4 screw holes in the outer edge and a threaded hole in the center that the lens/shutter screws into. It mounts onto the lens board of a camera.
I thought there was one on the back of the lens but there is not.

The shutter back can be stuck if its been years since it was last open.