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chiroshi
M_V
I’m pretty certain it’s sealed non serviceable cartridges in brand x posts. I’ve had my 31.6mm one apart and don’t remember seeing any valves or anything.
The cartridges are/were available. You’ll likely have to find a part number and do some searching on that. I thought mine needed a cartridge and it seemed like the 200mm one was out of stock everywhere so I wondered about fitting a 170mm one but then a clean and serviced had it working well again.
They are pretty simple inside so worth stripping it, cleaning everything and regrading to see if it fixes it. I didn’t bother with buying any dropper or dissension specific grease or anything, just used bearing type grease that I already had.