Something like Tri-Flow Superior Dry Lubricant which is made for dry and dusty conditions might work well.
Indeed it might Larry!
I'll certainly be looking into this product, as I've successfully use Tri-Flow Superior before, but for some reason haven't come across the "Dry" version. Hopefully it is the same, and is plastic compatible, though I've yet to find a spec sheet that says so. For that matter, I've always been a bit nervous about the regular Tri-Flow even though they do claim safe for plastics, but they also say it has petroleum oils and solvents, which does not sound so good.
Question ... does the Tri-Flow Dry formula stay wet long enough to act as a penetrant so it would have the potential of carrying the graphite into tight places?