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FYI racetech emulators do just that, "emulate" the function of a cartridge fork. They do this by removing the damper rod ability to resist fluid flow through the compression orifices and then place shim with adjustable pretension over the hole in the top of the damper rod.
This allows the shim to be adjusted in the nature in which it allows fluid to flow through the tube during the stroke. The upside is cost, ability to retrofit to damper rod forks, somewhat separation of compression and rebound. Compression with shim, rebound with fluid through orifice still.
A true cartridge has shim stacks for both rebound and compression and you can then tune these shim stacks to behave in almost exactly the way that you want. In addition the adjusters are mounted externally to allow for quick adjustment (emulators must me removed and oil changed for rebound).
These take an existing cartridge and modify it for use in the ninjette housings. One leg compression one leg rebound since there no lower adjustment capability in the lower for leg outers.
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