Sad to hear you're retiring BelArg.
My dad who also is retiring very soon after many years on the same type said something that stuck with me: "what use will I have for all of the little tricks and techniques that I've learnt during all these years when I'm retired?"
It's sad but true. Probably no use at all, but as the previous poster said, I hope you continue to give your insight and advice. It is much valued by us in the younger generation.
Sorry for the thread drift.
As for the main question: Sometimes you just have to understand that some people just don't listen to other input than their own. The only trick left is trying to make them believe that the input you are trying to give is their own idea. It takes a bit of coaxing but by leading them into the problem the way you see it, they usually arrive at the same conclusion as you did. It has worked for me on numerous occasions (and I'm just a F/O!
)
/LnS