jes45,
Sorry that I came on strong, but it seemed you were advising him to blithely ignore ZYX's warnings. That struck me as imprudent when a $2K+ cartridge is involved.
CardiacKid's question was, "Will Stylast travel far enough up the cantilever of a ZYX to cause damage?" Neither of us has the data and scientific skills to answer, but the risk is certainly greater than zero. I prefer to heed the manufacturer's warning, you prefer to ignore it. YMMV, so he should consider both sides.
Will capillary movement of a liquid occur inside the ZYX cantilever? Sure. Water climbs up a drinking straw and the narrower the straw the farther it climbs. This effect is readily visible. Since ZYX chose to make their cantilever hollow, their warnings about liquid cleaners seem quite sensible.
I certainly didn't suggest match strikers were a new idea. In fact I credited a guy who's used it for decades himself, as you suggested. That makes it more credible, right?