Fujica GW-690 Lens openin tool

[Jaava]

Where to get a lens opening tool for Fujica GW-690 back lens group:

Pic: Backside of the lens assembly​

I assume the little points/holes (6 pcs, see pic) in the rear lens frame are meant to be used for lens opening tool.
Service manual says: Turn the rear lens assembly counterclockwise to remove it.
Unfortunately there is no picture of the tool in the Service Manual that could fit into those holes, so I cannot get even a glimpse.

Are there any tools commercially available for this or is the only resolution to make one?

 

[Jaava]

I was wrong about the items in the previous message pic: The "attach points for lens opening tool" were integral part of the male helicoid.

Here is my new interpretation:

Now there are two slots for conventional lens opening tool (to open the rear lens frame).

But there turned out to be a new problem: The rear lens frame is tight, and I cannot screw it open. It does'nt even budge a bit.

BTW: Reason to open the rear lens and shutter: There is a lot of play between the male helicoid and (rear lens group + shutter + front lens group).
I think the holding ring that attaches the shutter to male helicoid is not tight.

 

[Jaava]

I carried the lens assembly to a local camera workshop, specialised to older cameras. I asked them to try to open the Rear Lens Group from the Shutter. Nothing else.

I felt too unexpierienced. Now, if the whole lens assembly breaks, it is caused by a real professional.