I've just spotted these adjustable dampers for Roadholders on UK Ebay 280391577565 expensive but look well made and thought out.
Sorry but don't know how or forgot to get the direct Ebay address.
Cash
If you were going to all the trouble to build new cartridges I don't understand why you wouldn't include some shimmable, high speed valving. It looks like there's only a needle valve.
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