Two suggestions: Johnny Woods in England sells a neat little steel & wood platform that sits above any known vent system and is more comfortable than blankets over metal ribs in the cases. And when fooling with the stock vent, you'll soon find that the stock tube simply pushes in for a very loose press-fit. So to add a 3000psi-rated steel vent tube(!) the case must be drilled and tapped.... dropping metal shavings almost exactly into the ring & pinion gear mesh. HEAVY greasing of both drill and tap is necessary to minimize this but will not totally prevent it. Removing & opening the ZF to drill & tap will. IMHO, the only sensible thing about those vent systems is, in the very rare event of liquid coming out of the vent, it's routed away from the rear tires....
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