KevinF wrote:
Very amusing IanF and Ted Chance (who coyly avoids mentioning on that web site that he is the one and only, 'original' Mr DuffChops , but it doesnt' help the poor horn player who has really got a genuine, perennial problem with his/ her 'duff chops' does it?

On the contrary, I think it can. There are several ways to deal with a problem, one of which is to realise that you aren't alone with it and that it is possible to see the lighter side of any situation.
The DuffChps site also mentions (albeit in a jokey way) the concept of the psychological effect on the embouchure.
I'm a motorcyclist. One of the first things bikers learn is that if you want to avoid hitting something, don't look at it. Focus on that tree in the middle of a bend and that is exactly what you will hit. But it's no good thinking, "I mustn't look at the tree. I mustn't look at the tree. I mustn't look at the tree." All that does is make you look at the tree! No, you focus on the exit of the bend, which is the whole object. I think horn playing is similar. My teacher, Sydney Coulston, used to say hornplaying is 99% in the player's head (he also once said I was mentally retarded but that's another story!). Tom, as long as your embouchure isn't giving you serious pain I would suggest trying to ignore what it feels like. Don't look at the tree. Focus on something else. The music. The pitches in your head. They are what are important.