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The info about DLC that I have - so far at least- is that if you have a surface roughness greater than Ra ~ 0.93 microns you can get aggressive wear due to flaking of the coating on the peaks - I have been promised some SEM phots to demonstrate but so far I have had no reply.
I have been considering finishing my new forged rockers with DLC but my cam grinder, who will machine thr rockers is worried about the finish. If the finish is good enough DLC would be great but again would preferentially wear the rocker.
F1 engines run DLC against DLC but long term durability isn't a major goal.
If ' tuftriding' on the Motorsport shafts is good then why not simply tuftride some standard shafts? It will only cost a few dollars and is a relatively simple process.
If you could fit a bush I would agree with the comment above that using a modern PTFE impregnated materisl would seem the way to go and someting I would prefer.
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