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If I were to do anything, I'd just rub the cables with a carpenters pencil. Only because I have a box of 100 odd Leica branded pencils I was given that weren't given away at a trade show.
Coming from a motorbike background, cables used to be oiled. Then the cables were just inner cable and out with no inner liner just metal to metal. Then cable technology caught up and there became no point in lubricating a cable. If anything it could make things worse., by causing increased frixtion.
Am not a fan of ptfe coated cables, as brickman says the shedding of the coating is an issue. Found that replacing the inner and outer and cutting the outer properly so the outer liner doesn't get deformed improves things alot.
Wonder if adding graphite to the inner cable before instalation?