Although i have bought the modified part, the thought of pulling it apart made me put it off. I'm glad i did now, because i found that oil was starting to appear around everything that had a seal. I decided to take off the Elephants trunk breather, to find that due to doing many short journeys that it had gummed up with white sludge the plastic ball that acts as a timed valve. It was blocked solid. Since reassembly theres not been one drop of oil on my driveway.