Soennecken 222 Disassembly Question

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I have a Soennecken that's in need of a new piston seal and I am having trouble figuring out how to get a good grip on the internals to screw them out. I assume that there is a guiding pin, like in the 4xx series Soenneckens, so I'm aware of potential risk of destroying the internal celluloid threads.

 

Here's a picture of the part in question. PICTURE LINK

 

The blind cap pulls out just a bit under 2mm. I've read that the pin in the blind cap can be knocked out, but I'm quite wary of attempting that approach. I'm wondering what methods other people have used on these pens to get them apart. If possible, the specific tools that you use and where I can buy them would be a huge help.

 

Any thoughts would be greatly appreciated!

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After a lot of hair-pulling, I managed to get it apart with a pair of very fine tweezers. Not ideal, but I managed it without damaging anything. As expected the cork was fully degraded.

 

For anybody attempting this that finds this thread, there is a small brass guide pin on the part of the piston that extends and retracts. It must be extended to get the rest of the unit out, or it will utterly destroy your pen by tearing apart the inner threads that the piston mechanism screw into. The way that I managed this was by having it mostly extended, then periodically adjusting whenever I hit any sort of resistance. If you start with the piston in the fully retracted position, you're going to end up with bigger problems than a bad cork.

 

Still curious about what others use in their repairs!