This is another example of the type of information I have been compiling for my comprehensive spotting manual (even though this one came from an alert thread). I think many of these fine details are known only to Andy, and we only find out about them when something doesn’t work for us. Here is a link to that well hidden manual that has been updated several times. I have no doubt it will need to be updated again the next time a hidden limitation or feature is discovered.
Glenn AB3TQ