I don’t. I noticed on the side is threaded with a nut so was wondering if it was adjustable for some reason.
A bored guy in the factory with a direct connection to Technical Direction twiddled it and put it in the right place before it lost some wax and corroded slighly.. If its half open at 20 degrees C that seems about the right ballpark. If it is more closed on a cold day and completely opens after 20 minutes of donuts in the Asdas car park on a warm night, it's about right.
