looking for this special tool

I don't know if it is that special but I'm looking for a tool to unscrew these nuts. they are M3 or M4, round and have 2 slits .
No, a flat screwdriver won't do because the screw thread sticks out 10 to 15 mm.

Pic won't open.  Are you talking about collet knob tools perhaps?

mjrippe said:

Pic won't open.  Are you talking about collet knob tools perhaps?

Click to expand...

aha , yes could be but the thread stick out exactly 25 mm.
won't be easy to find. It's M3
picture opens perfectly here

What was the photo taken with?

try this one

Look at Insert Bits.  They come in different sizes, so you might be able to find something that will work for you.

hodad said:

Look at Insert Bits.  They come in different sizes, so you might be able to find something that will work for you.

Click to expand...

I checked , but most of them can't hold a 25 mm long  screw thread and the outside diameter of the tool should be less than 5 mm.

Didn't they have something like that for the nuts on the knobs of a 4k/6k, probably also 9k? I have no Idea how it might be called, but maybe it rings a bell?

Michael

Michael Tibes said:

Didn't they have something like that for the nuts on the knobs of a 4k/6k, probably also 9k? I have no Idea how it might be called, but maybe it rings a bell?

Michael

Click to expand...

Again, the lenght of the thread screw is unusal. It's for opening VU meters.

unfortunately none of the attachments can be opened

Picture isn't opening for me either. If you were uploading a properly formatted JPG the forum software would recognize it and display it. It's not. Something is wrong with your files.

*ahem...*

Khron said:

What was the photo taken with?

Click to expand...

iphone as HEIC , converted to jpeg.

I had a hunch that might be the case. Just the other week, someone else tried to post some iPhone photos here, and despite the ".jpeg" extension, neither the forum or desktop computers could open / "see" those.

... because Apple 

https://groupdiy.com/index.php?topic=75305.msg955060#msg955060

Honestly , the latest OS  (catalina ) sucks big time.

I can’t see the photos but from the description perhaps
https://www.pbswisstools.com/en/tools/quality-hand-tools/screwdrivers/product/pb-1961-50

beat me to it, Paul. That's it. Look for a slotted spanner nut driver. They are specific to the nut size, unfortunately.

...and then there‘s a flat screwdriver and a dremel tool

Gold said:

I can’t see the photos but from the description perhaps
https://www.pbswisstools.com/en/tools/quality-hand-tools/screwdrivers/product/pb-1961-50

Click to expand...

Perfect , that should do . Thanks

nashkato said:

...and then there‘s a flat screwdriver and a dremel tool

Click to expand...

No won’t do. There’s a 25 mm  rod sticking out.