How to disassemble a 1992 Delta V fork?

Hello everyone,

I am a French bike enthusiast and naturally I have some Cannondale in the garage (Raven 1, two SV from 1997 and 2000 and a Delta V from 1992).

The Delta V is in very good original condition. The fork is a problem: it goes down and does not go up.

There is no schrader valve to inflate the fork so I think it is elastomeric.

But the biggest problem is that I do not understand how it disassembles: there is nothing that unscrews completely. I turned the two knobs below the fork (the plastic one and the metal one), even with a little force, I can’t start to disassemble something.

The only thing I could remove was a flat head screw that is on a nut under the plastic knob. But nothing else happens next. Nothing moves.

Do you know how to proceed ?

Thanks for your help.

With some photo, it's better...

IMG_5138 (Copier).JPG

IMG_5152 (Copier).JPG

IMG_5164 (Copier).JPG

IMG_5163 (Copier).JPG
The fork don't rise.

IMG_5161 (Copier).JPG
The two knobs.

IMG_5160 (Copier).JPG
I have remove the flat head screw on the nut... but I can't remove something else.

IMG_5165 (Copier).JPG

IMG_5167 (Copier).JPG
Under the fork or on the fork ? No valve.
 

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