DDK - Die Deutschen Klassiker

I recently bought a NOS Koni front strut 911.341.041.10

I wanted to see what cartridge it came with, so I removed the collar nut using this tool from ebay
https://www.ebay.co.uk/itm/143292531019 ... R5DSu-SlZQ

Very straightforward.

But the cartridge won't come out. It seems there's an O-ring in-between the cartridge and the strut housing. How do I get it out without damaging the O-ring?

That may have been left over from a previous change of inserts?
The rubber seal is normally under the gland nut, is there one there?
https://www.early911sregistry.org/forum ... eplacement

The strut is NOS. Never had any previous changes of insert.

The top nut on that strut is a collar nut (no rubber seal). I'll take some pictures.

BTW, this strut was introduced in 1974 (for Carrera MFI), not like the wet types of the earlier Koni's.

Good morning.

I carefully used a jeweller's pick to remove the O-ring but without pricking the rubber:




Oh my goodness me, it's a wet type strut after-all, but of a later design: